A mix of the words ‘Ham’ and ‘Ass’. A term referring to famous Spanish tennis player, Rafael (Rafa) Nadal’s fat ass. The word ham comes from his subway commercial and so the mix of that and his large ass come to create the word ‘Hamass’.
“Damn look at Hamass…it looks really good in those shorts!”

“Hamass makes me feel things.”
by Ilovefatassedtennisplayers October 28, 2023
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The process of catching a roommate, sibling, or parent completely off guard (usually during the morning hours), and waiting outside their door to fart. This usually happens right as the recipient's door is cracked enough to see you, but still having enough space to have a corridor to escape.

Essentially, it's a form of tactical cropdusting; it's considered a weapon of mass flatulation by the United Nations. Can lead to human rights abuse charges if caught (or being subjected to a beating by roommates, or family members).
Mom: "Good God, Timmy waited outside my door, and farted right as I could barely see him. It fucking smelled!"

Dad: "That's my boy, I taught him the art of how to Hamass."
by The-Magnificant-Mr-Shart October 15, 2023
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