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Acronym of "Two Hands 'N' Head", a phrase for men to illustrate how horny they are/how sexual they find someone by referring to the size of their erection as being able to wrap around two hands and still have the head of the penis emerging from the top of the grip.
Person A: "Mate, did you see that girl last night behind the bar?!"
Person B: "Hell yeah, I was working a THNH!"
by PFMelmer August 08, 2011
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