simply a 'poo-moustash'. generally due to recieving a dirty sanchez or the partial construction of a dirty Bepe or even a dirty David
by ThrashTang monkey October 7, 2003
Get the poostashmug. Hey, check out your neighbour neil. He has poo on his top lip. He looks as though he doesn't even realise.. I wont be lending sugar to him anymore.
by kazoo and kasoo November 24, 2004
Get the poostashemug.