(noun) 1. a young buck, ragamuffin or cribster who continously undermines the dominance of the older more sophisticated silverback male 2. A charming young monkey 3. A young Irish male
Silverback -

"If that youngfella wasn't so funny/charming I'd glimp the kneecaps clean off him."
by Hawky1 July 9, 2011
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A very good StuntRunner player, first in the world and good at walk duos and teleport duos on Golden Trophy.
“Is that really YoungFella?!” “How is he in our lobby?!!!”
by RecRoomGod February 25, 2022
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