A word originating in Western MoCo (MD). Refers to when your texting someone, and they take a ridiculously long amount of time to respond.
"Mo, I txted you yesterday but you still havent responded. why you gappin on a man like that"

"Man I txted Jasmin like 7 hours ago and I shes sent me shit. Girls gappin on a brotha"
by TutnamTT October 07, 2011

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