The word
rumpus can refer to many things such as your ass,
toshi, butt, booty, backside, etc. The word rumpus comes from the word ramp which can sound like rump which can mean ass, toshi, butt, booty, backside, etc.
Rumpus can also refer to a group of asses, toshis, butts,
bootys, backsides, etc. Which is in the plural form. It can also mean loud noise or mess.