Top Definition
Profuse sweating of the lower back that signals in the words of Dave chappelle "I had to take a dump, I had to take a dump immediately." If a dump is not taken, the lumbar sweats can lead to an embarrassing sweat stain on the upper but crack region of clothing.

lumbar sweats are going HAM right now
Ben: dude did you sit on something wet?

Steve: Nah I gotta take a shit really bad,

lumbar sweats are going HAM right now
by Steven18 December 04, 2013

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