to perform intercourse with an armpit. i.e. pit-fucking
dude, my pit's sore from all the piffin' last night!
by Burrito BB October 26, 2007
the act of gettin high off some bomb ass weed... wether it be dro or haze... Actually smoking...
im piffin it when i get off work.
by Queen Lala December 10, 2006