During oral sex, the action of lifting one's shirt up to deposit a load onto one's own stomach.
Beats the alternative of getting it on your clean sheets or your favorite shirt.
"I knew she wouldn't swallow, so I had to pull a shirt move."
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An "event" which includes many dudes, and only one participant of the opposite sex-usually your friend's mom.
"Hey Ricky, I heard your mom came in first place in the guyathlon yesterday. High five."
Or:
"We had a guyathlon on your mother, thank you."