Top definition
When a group of men get together and strip down naked then one man proceeds to entering his penis into another man's rectum. That man inserts his penis into another man's rectum and so on until a full circular formation is formed, hence the name formation 0.
Kyle: Hey Nathan, those cool guys down at the abandoned warehouse invited me to their nightly formation 0. I don't know what it is but it sounds cool.

Nathan: No man that shit's hella gay!
by N8_Killa March 24, 2007
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