naked sit-up
A fancy way of saying you try to do a sit-up while naked and your cock is in your mouth. Most guys can’t do it without looking like a confused toddler.
My neighbor tried the naked sit-up and it looked like he was trying to eat a sit-up.
My dog does the naked sit-up every time I leave the house. He’s got a cock and a mouth, what more could he want?
My friend’s dad does the naked sit-up every day and it’s his way of staying young.