When getting headfrom a girl, instead of cumming in her mouth, on her face, or in her hair you pull out and cum in her one of her nostils; letting her take it straight to the brain while yelling "BOOM, HEADSHOT!!!"
Dude, I gave my girl the headshot last night! She was so pissed!
See head, blowjob, brain, cumshot, funny, wrong, headshot