1. verb - to fail excessively or blow at something hardcore
2. verb - a large expulsion of fecal matter
3. noun - a holocaust gone wrong
1. "Dude, remember when Nick tried to do yoga and got stuck with his legs behind his head for 2 hours? That was a massacrap."
2. "Excuse me, I haven't gone to the bathroom all day and need to massacrap."
3. "Remember that time Hitler left his dog in one of the gas chambers? That was a massacrap and a half."