A long line of men on all fours where each man is eating the next man's asshole and in having his asshole licked by the previous man. This 'line of asslickers/asslickees' can continue on to form a circle, and is colloquially referred to as a 'man snake eating it self'.
Douche1 - "Hey bro that 'man snake' after the NikelBack concert was awesome, but now my mouth tastes like ass"
Douche2 - "Yeah mine too bro, mine too"
After blowing out your pals fart box,you pull out with fecal matter on your peen and proceed to masturbate furiously. Then send your cock juice skyward into your mouth an regurgitate it into your other pals mouth.