Something that you feel great desire to hump (strongly) or something that you would really enjoy
MAN 1 "Hey man do you want a milkshake?"
MAN 2 "THAT SOUNDS HUMPTASTIC! Although I hear they rape dogs....."

by blonde71694 March 29, 2008
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A great feeling of joy and excitement that makes you want to (strongly) dry hump any living thing you see.
After I got my test score back and saw I got a WHOLE 69 PERCENT (the best grade I’ve gotten this whole semester) I felt humptastic and started dry humping the teachers leg.
by urban peepeeface February 1, 2021
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