When the comfortable, always present yet never recognized gap between the male knees is forced shut unwillingly (Usually caused by too many people sitting on a bench, couch, bus, etc...). This causes the vacant area for the testicles to do as they please to become occupied by the thighs. This causes the room for one's balls to become
blitzed. A few warning signs which often come before a
ballroom blitz are "Is someone sitting here?" or "mind if I
take a seat?".
Mike: Hey Tim! How's it going? Mind if I sit by you?
Tim:
No disrespect Mike, but I'm not just going to let you blitz my
ballroom like that.
Football Announcer: And he's going for the
ballroom blitz... And he gets the sack! (thought I'd throw in a pun)