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Eysturlid is slang for a homosexual in certain parts of northern illinois. Like many american english words, it is also verbed gracelessly and can also be used as synonyms with "having homosexual intercourse".
"Wow, that guy over there is a real eysturlid"

"I see he's about to eysturlid his boyfriend."
by John MacFarland January 27, 2004