Snap-n-When you do something killer for the greater good of mankind, regardless of fear.
Usually, a snap occurs when against your better judgment you attempt something which could lead to utter failure.
After spending all day building a huge ramp, Neil was having second thoughts about the ramp's structural integrity, yet despite those concerns Neil had a snap, and tore at the ramp with complete disregard of the consequences.
Carl approached Anja, the stunningly attractive foreign exchange student, and asked her out, despite the fact all of his friends told him there was no way in hell she’d give him the time of day, let alone go out with a chump like him.
Snap tends to form in the gut, versus in the mind of the person performing the snap.
Oddly enough, snap seems to signify a certain level of courage, which attracts women as much as it attracts scars and fractured bones.