Two Drag Pass.
Two drags...Then pass.
Usually referring to marijuana; each person takes two hits then passes it to the person next to them (or whoever it's supposed to be passed on to.)
Ronaldo: *takes a hit, then attempts to pass*
Finneh: *prepares to take joint*
Khiel: Dude, he gets another hit. 'Tis 2DP. >:O
Ronaldo: omfg *win*