P.C.S.R.P.
The moment after a guy finishes sex or finishes watching porn and suddenly realizes he's a total loser for either A. Being gross on/in his partner, or B. Making a fool of himself after getting off to a movie.
'I just realized I look like a dirty sock.'
'He watched the whole movie and then cried like a baby.'
He said, 'I'm a total waste of space.' after the third cumshot.