In the classic and grounbreaking video game NBA Jam, it was the name of a spectacular slam dunk performed when "on fire." In certain situations it would shatter the backboard.
MONSTER JAM!!!! He's on fire!!!!
by Schlichting October 01, 2005
n. An incredibly large bowl movement. Really just unbelievably big.

v. The act of expelling same.
Don't go in there! I just took a monster jam.
by Turd Fergusonne January 18, 2009
the biggest bong hit you've ever seen
(Juan-Carlos rips a massívo rip, holds it for like, six seconds, lets out a big huge cloud of smoke)

Ramon- holy frijoles, Juan-Carlos ! that was quite the monster jam ! only now there's none for me, you greedy fuck !
by JrBcnChz June 10, 2010
to brutally rape and power-slam a hot babe through her pussy until she bleeds and screams and is rubbed raw, with an enormous cock
Man, Weaver, I really love to monster jam sue
by The Beast April 25, 2005

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