When someone is unable to complete their sentence or bring across his point, whatever and crap or whatever and shit is substituted to complete the sentence.

On discord there is this thing where you can talk to others using your voice

A game enjoyed by males by hooking up with a random taking her back to her place have sex and wait for her to fall asleep then taking a dump in the toilet and not flushing and gap it out of there could also be called the tap crap and gap