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It's an adjective. It defines some feature of human character.
A jolly guy who gets the proper knowledge when he learnt something and he is able to explain almost everything with a funny attitude in correct logic and humor. Though he is a nerd but social. He is thirsty to get knowledge of everything.
Girl-1: Hey.. what do you think about this guy. isn't he a genius?
Girl-2: I just love the way he is talking? so chill guy.
Girl-1: Yeah he is a jollynerd.
by Vexatious Scream April 21, 2017
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