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1.
Another way to say "taking a shit" or "dump", "poop", "crap", or "dropping anchor".
John I'll be right back I got'a drop a heat spike.
When my bitch is done at the dogpark she drops the heat spike.
by Keith Wilkinson August 17, 2007
 
2.
A sudden raise in body temperature that starts in the lower back and radiates up the spine as a result of realizing a major problem caused by one's own error.
Joe had a heat spike when he realized he would not meet the schedule because he had produced the wrong pieces.
by carasone March 25, 2009