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1.
Down to have fun. Signifies a positive opinion on the subject of having fun. Usually involves alcoholic beverages.
Jenn, "Are you dthf tonight?"

Liz, "Yeah, I really had a bad day. I need to have some fun tonight. "
by ewright35 May 15, 2011
 
2.
Down to... HIGH FIVE
"Are you dthf?"
"Umm duh man!"
*commence high-fiving*
by tactown13 May 26, 2012