throwing signs
 v. phr.— «Just outside El Paso County Jail, women show up daily to “throw signs” to their men, spied in silhouette at the long, narrow windows of their cells.…Being attuned to fringe communication, he was intrigued in 1994 to witness gang members “throwing signs” to one another.» —“Outside Jail, A Dance Of Love” by Teresa Annas Virginian-Pilot and The Ledger-Star (Norfolk, Va.) Feb. 19, 1998. (source: Double-Tongued Dictionary)

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