The dark side of one's personality, the part that screams and shouts inside you in protest at the wrongness of society. Can be released through song and dance of a particular type, as personified by 'Gillespians', the followers of the band 'Blue Gillespie' and the members of that same band.
I really let my Gillespie out last night. I hope he didn't kill anyone while I wasn't looking.

You can see the Gillespie in his eyes when he sings.
by Ms Katisha July 22, 2010
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When your partner creates a tight seal between their mouth and your asshole. You fart, thus causing their cheeks to expand much like the cheeks of jazz great Dizzy Gillespie.
I ate a quart of refried beans then gave my lady a Gillespie that made her eyes bleed.
by Donnie Most February 1, 2016
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A pie made of someone named Gilles. Like in Sweeney Todd.
Well, Gilles has been killed and baked into a pie. I guess he's a Gillespie now.
by sarah sponda January 30, 2011
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A Gillespie is a moronic or vain individual who cannot take a joke or will never stop repeating the same joke. A Gillespie will often attempt to win praise from its peers with a self righteous flex (boast) about his personal life. A Gillespie has also most likely spent £40+ on vbucks and then has abandoned the account with said virtual currency.
“I met a Gillespie today”
Aw shit sorry man”
“He looked at me”
Oof
by MainManCraig December 12, 2018
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A Gillespie is a reptilian creature with a severe desire for attention and admiration from its peers. It’s incredibly irritating and futile attempts often end with a being having a severe disliking of Gillespie’s on a whole.
I came across a wild Gillespie today.

A Gillespie desires attention at all times.
by MainManCraig December 12, 2018
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Having extremely greasy pubic hair while ploofing and doing the savoy.
Oh man, I just had tons of the gillespie when i had sex with my girl this morning.
by Gillard March 7, 2007
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