When a man has to pee sitting down, he has to tuck it in order to prevent accidental pee-leakage.
Caleb: Man, I just peed sitting down for the first time ever.
Caleigh: How does that even work....like, do you just tuck it or what?
Jerking off in front of an underage girl on a hotel bed.
Rudy Giuliani was "just tucking my shirt in" in the Borat clip.