"Brexit", when used as a verb, is the act of commiting an unnecessary and incredibly dangerous tackle in football (soccer).
*Player speeding past most of the team only being followed by a defender*
"Oi! Brexit him!"
the act of absolutely snapping someone in half on the football pitch
Dave: what a brexit tackle Gary just made on Barry!
Gary: “laughing”
Barry: “dead”
Sexual position. When u promise to pull out but you don't.
Ugh jack is such a fuckface be pulled a brexit on me last night
To agree to ejaculate outside but change your mind at the last minute
He told me not to use a condom because he'd throw up outside, but guess what, he brexited
'Jesus, Mary and Joseph and the wee donkey, who thought that Brexit would be anything other than a Cataclysmic fuck up.'