A person whose unattractiveness makes a guy's schlong very soft. It has the opposite effect of the drug Viagra.
Robbèrt: That girl so ugly, she a whole ass viagra antagonist
by Bkho November 21, 2021
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Someone you just don't wanna date, because your shlong just instantly goes down.

An viagra antagonist is also an agent that blocks your way to a massive dong.
This is typically a person, but works with whomever you're normally into.
He is so unattractive, totally a viagra antagonist

Damn you saw that girl walk past?
It feels like i've received a Viagra Antagonist.
by MedicalRapper November 21, 2021
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