Gillespie
A Gillespie is someone who is significantly older than they actually are, probably look at facebook memes.. A stealth boomer.
Person 1: That 20 year old came over to me and asked me what the new slang is
Person 2: That's not a 20 year old, that's a Gillespie.
Person 2: That's not a 20 year old, that's a Gillespie.
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