Acronym. S.Y.D. (Smell Yo Dick) originating from the 2007 Riskay song of the same name. The song is a suspicious lover's inquest into her lover's infidelities at which point she demands to smell his genitalia for aromas of amorous activity.
Our hallucinatory friend Syd, is an imaginative word for the underlying spirit of acid. Popularized by Eminem as slang for acid..."Try syd and get fucked up worse than my life is. My brain's dead, wait, I'm trying to get my head straight"
Our friend syd dropped by to say hello, and ever since then we've been trippin balls.