P.E.G.S.
When a guy feels like he just got caught doing something embarrassing after he finishes doing his thing by himself. It only lasts for a little while, like when the bell rings and you realize you're still in the classroom.
'I was watching a movie and I came, and now I feel like I should be in jail.'
'I just did it in the car and now I feel like everyone can see me.'
'I was eating pizza and I came, and now I feel like I should apologize to the pizza.'