Brotherhood of the Traveling Pants

When a friend or bro leaves a pair of pants at your house, you

ejaculate on said pants, and return to the person folded.
Usually one claims they have been washed.
The hilarious result is when they put the pants on and don't realize until it is too late, that they have a huge cum stain on their pants in public.

Dude, Aaron his pants at my house after changing into his swim trunks, I am going to let him join the Brotherhood of the Traveling Pants.