There are two stages of swimdick:
1. Your penis will shrink to at least a fifth of its
normal size due to cold
water temperatures.
2. Your penis will become erect at the sight of bikini
bitches and will be impossible to hide.
Me: dude, what's wrong? Why are you holding your
crotch?
Male Friend: I've got swimdick,
man
Me: I feel your pain