pylon!
childhood yell also often referred to as pile-on

if someone fell in the playground or was relaxing and the shout "PILE-ON" was heard, everyone jumped on them
( GrandmaOfShoes and thanks for the trouble you took from her eyes, Sat 2 Feb 2008, 14:33, archived)

Ahh, yes!
We had that with "BUNNNNDLE!"
( NinjaBadger has a dirty little secret., Sat 2 Feb 2008, 14:34, archived)