1. When you go to Niagara Falls while on Viagra.
2. When your Viagra wears off and your erect cock starts to fall. Hence "Viagra Falls"
1. Bro 1: Yo I pulled a Viagra Falls.
Bro 2: Nice bro I've always wanted to do that.
2. Bro 1: Yo don't tell anyone but I had to delay my date 2 hours waiting for my "Viagra Falls" to happen
Bro 2: Yo that is fucked but your secret is safe with me.
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