verb (used with object), two-timed, two-tim·ing. Informal.
Origin of two-time
Examples from the Web for two-timing
Contemporary Examples of two-timing
Her boyfriend Josh was two-timing her with his ex—a girl named Rachel Wade.Mean Girls Love-Triangle Murder
August 6, 2010
"to deceive, cheat, betray," 1924, perhaps from notion of "to have two at a time." An earlier reference (1922) in a Kentucky criminal case and involves a double-cross or betrayal, without a romance angle. Related: two-timing (adj.); two-timer.