-When someone's stench is so strong, its slapping you in the face
OR
-When somethings are just not right.
OR
-When Someone makes a lame joke
James: Oh hey Jenay
Jenay: HOWMP !!!
James: What??
Jenay: Yo breath stank nigga !!
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The sound Homer Simpson makes when he is eating something.
All right, pie, I'm going to be doing this howmp, howmp, howmp, and if you get eaten, it's your own fault.