Top Definition
The secret motto of the Sigma Alpha Epsilong fraternity. Now is used as a measure of truth between brothers. Also used as a greeting, agreement, or kudos.
man 1: "I railed this whore last night in the ass"
man 2: "BS!"
man 1: "phi alpha i railed her in the ass"
man 2: "right on, i knew she was a whore"
by angelnine9 September 21, 2006
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