yat karosi yad asnasi
yaj juhosi dadasi yat
yat tapasyasi kaunteya
tat kurusva mad-arpanam

"Whatever you do, whatever you eat, whatever you offer or give away, and whatever austerities you perform—do that, O son of Kunti, as an offering to Me."

Tat kurushva = do that, mad arpanam = [as] offering to Me [Sri Krishna]. This is what we daily recite in 'kayena vacha amnasaindhri aiva... Narayana iti samarpayami'. Whatever we do by mind, words and organs, we should submit to the Lord. Yat karoshi = whatever you do [of worldly living], yad asnasi = whatever you eat [ for living], yad juhoshi = whatever yagnas you do, yat dadasi = whatever gifts [dhana] you do, yat tapasyasi = whatever meditations you do, tat kuruushva = do all of them, mad arpanam = in My [Sri Krishna's] favour, kaunteya = Arjuna. He advises Arjuna not to do anything for his own benefit but in favour of the Lord. What will happen if we do not do that way? Just like in Alwar's case, the Lord will find ways and means to get us submitted to Him. We should notice that the Lord has been mentioning activities in devotion to the Lord; like cleaning the temple, lighting the lamps, or making garlands for the Lord, etc. We may get a doubt. What about our other activities like going to the workplace to earn, getting married, acquiring property, etc., which are all our worldly activities? Are we to do them or stop them? Not even in one sloka, the Lord had ever mentioned these. Is Gita meant for those not involved in worldly activities? Are Gita preachings useless? Are our daily activities irrelevant to Gita? The Lord replies these doubts. Whatever He told earlier are shastra praptam or related to what are emphasised in Vedas. Karma yoga or Bhakti yoga come under this topic - Shastra  praptham. There are others which come under the topic - loukeeka praptham; or activities to be done to live in this Universe. Activities required to live in this world or loka is called loukeekam; what we have to do as per Vedas is vaideekam. Here, the Lord says that just as we have to present all our Vaideeka actions, we have to do all our loukeeka actions also in His favour. In loukeeka praptham, there are two subdivisions -swabhava praptham and artha praptham. Swabhava praptham is all actions peculiar to anyone depending on his self, like a kshatriya fighting, etc. Artha praptam consists of all activities which are required to make an honest living. Any activity done should be just and fair and never illegal. All actions should be governed by Shastras, society and country rules and regulations. Every action should be dedicated to the Lord. Even while eating we should realise that the food or the cook or the person eating are all His bodies and governed by Him. So we have to offer everything to the Lord and then eat. Every ritual is in His command and so all of them should be dedicated to Him. A gift offered should be thought as His property is given to Him by Him. Every action should thus be dedicated to Him. This is what Alwar implies when he says that all his mind and organs were at the Lord. Swami Vedanta Desika in his Tatparya Chandrika has mentioned that when we chant this sloka we should modify it this way:

yat karomi yad asnami

yaj juhomi dadami yat
yat tapasyami bhagavan
tat karomi tvad-arpanam.