The term originates from Richie 'Sharkface' Aprile of Sopranos fame, who famously ran his car over Beansie twice in quick succession, paralysing him.
"Yeah, he was in the street with an AK, so I stole a jeep and sharkfaced his ass"
Actual Internet Name: Sharkface217
"Oh crap! He pulled a sharkface on us!"
"Man, if he pulls a sharkface on us, I'll be so angry."