the title phrase incorporates a sexual pun. the phrase "going down on love" is used in the song in the context of "giving up on love." he even adds that he "got to get down, down on my knees," which in a literal sense would mean he is on his knees pleading for help or begging for forgiveness. but these phrases also imply a sexual act, although part of the joke seems to be that within the song neither the stated romantic longings or the implied sexual desires are fulfilled. andrew jackson, however, takes the title phrase combined with the pun to imply a promise by lennon to be a better lover if ono takes him back.