When you want to piss but the damn pee won't come out! Possibly because your urethra is jammed with cum, pussy juice, coke, whatever

Etymology: verb form of constapiss, which is cheaply and crudely derived from the term constipate

A person who doesn't realize they are transgender yet, or is in denial; an undeveloped transgender person. When they realize, it's referred to as the "egg cracking."