It is a term often misused by many in LoL, confusing it with top diff. It's true meaning is when your jungler out-jungles the enemy jungler, like tyler1, the inventor of the word and the best jungler in the world.
Me: Did you know Nightblue3 is the worst jungler in human history?
Friend: That's because he can't jg diff like tyler1, the best jungler in the world.
Nightblue's Fanboys: ThAt Is NoT TrUe *cry in sorrows
by Darkhen124 June 10, 2020
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