Top Definition
Noun/Verb: The process of making one gag on your penis. Gag symptoms can include coughing, excess saliva production, bile, and/or watery eyes.
1. My girlfriend's not very good at deep throating. I feel bad every time I give her a McGarnagle.

2. Sara is like a pornstar. After I McGarnagle her she begs for more.
by Wade - DP July 15, 2012
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