When you ejaculate on a females face, unless your gay, and you slap her ears right after.
I cant see....OWWWW!!! I must have gotten an Alaskan Flash-Bang!
Whilst in the midst of a sexual act (blow job, sex, handjob, anal etc) you aim your load as you are about to come into a the girl's eyes and firing off into them temporarily blinding her. Whilst she is blinded you cup your hands and slap either side of her ears to give her the ear 'pop' thus deafening her and blinding her for a short period of time as would a normal flashbang
"Will did not want to stay over so he gave her an alaskan flashbang and got his clothes and got out of there while she was looking for him"