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.
by PegasusP May 2, 2023
Get the Gillespiemug. by JPringle May 21, 2014
Get the Dizzy Gillespiedmug.