Smelled the Cupcake 

1. v. when an individual is preforming fellatio on a man and in withdrawing slightly, unintentionally lets the penis flick out and in continuing the rhythmical sucking receives an jab from the penis head to the nostrils at which point the party receiving the fellatio ejaculates all up in to the other's nasal passages. This can also be done by simply ramming one's penis into the other's nose with one's hand and blowing one's load simultaneously. Derived from instances when someone is eating a cupcake and another says "that cupcake smells excellent" and when the person goes to smell the other hits their hand covering their nose in frosting.

2. Can also be used to describe a fuck up. Used similarly to "screwed the pooch"

You really smelled the cupcake on that one

Smelled the Cupcake by The Frenchman64 March 2, 2011