SpongeBob SquaresUp FIGHTS Two Women [VIDEO]

9/15/2011 6:20 AM PDT

SpongeBob SquaresUp -- FIGHTS Two Women [VIDEO]

Who lives in a pineapple under the sea? SpongeBob Squarepants!!
Absorbent and yellow and VIOLENT is he? SpongeBob Squarepants' ... impersonator!

TMZ obtained CRAZY video of a dude in a SpongeBob costume picking a fight with two women on Hollywood Boulevard Tuesday ... and getting his porous ASS KICKED.

Cops were flagged down and Spongie was detained -- but he was eventually released because nobody wanted to press charges.