when one gets overwhelmed by sleepiness that they just seem to pass out where ever they are at really inconvenient times. Could be at a party, a movie, a concert, etc
Bro 1: Dude, where the hell were you? You missed my BBQ.
Bro 2: Yo sorry I just had a narc attack real bad, like 4 hours long.
Sista-girl 1: Did you see that hoe narc attack last night?
Sista-girl 2: Hell yeah that bitch been real drunk