Top Definition
Instacum, when someone is so attractive/sexy that the second they touch you it makes you instantly cum..
As Stacy's mum handed me a drink her hand brushed against mine, this made me instacum.
by AshAmes August 12, 2012
Cumming repeatedly and instantly until the penis shrivels up and becomes a chode.
Cam had to Insta-cum because of his large intake of Viagra.

Wil had to Insta-cum because, well, he's a fag.
by Gabe Smith Jr April 14, 2013

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