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."
by Lawren J. Reicher December 01, 2013

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