A prelude to an impending erection.
Homeboy #1: "Did you see that hot chick that just walked in?"
Homeboy #2: "Yea brah. Boner Alert!"
Homeboy #1: "Word."
by BooMSoN84 April 08, 2011
Massive erection forming or already formed
Her pokey nipples give me such a boner alert that between them and my prince albert we could have a wicked game of hoopla.
by A Key Tapper February 22, 2008
When your friend get a boner but doesn't know
Jacob-You excited for the speech
Justin-Yeah but , I'm a little nervous

Jacob-Just imagine everyone naked
DING!*
Jacob-Oh shit! Boner Alert!
via giphy
by Xx_billyxmayZ_xX April 20, 2016
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