1 definition by Lawren J. Reicher
To become ridiculously more attractive than one's former self, primarily, but not exclusively, as a result of puberty. A pun on 'level up', referencing the unexpected transformation of Neville Longbottom (Matthew Lewis).
"Did you see what that kid from ET looks like now?"
"Yeah bro, I didn't expect him to Neville up like that."
"Yeah bro, I didn't expect him to Neville up like that."
by Lawren J. Reicher December 2, 2013