1. of devil: connected with the devil or devil worship

2. evil: extremely cruel or evil

That guy's diabolic; he worships the devil and likes torture.
by Jafje November 14, 2006
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A crazy underground rapper. He raps with ppl like immortal technique. Beast ass freestyler, too.
beneath the surface
im overheatin your receiver circuits
by unleashin deeper verses
than priests speak in churches
what you preach is worthless
your worship defeaths the purpose
like president bush takin bullets for the secret service
diabolic, a one man brigade
spreadin cancer plague
fistfuckin a pussy's face, holdin a hand grenade
so if i catch you bluffin
faggot, ur less than nuthin
i just had to get that stress of my chest like breast reduction
by tumtum May 6, 2006
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an evil plan to do something bad and evil
dr. evil's "Alan Parson's project," "death star"

its also in a slipknot song "pulse of the maggots"
by elijah apperson March 30, 2005
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" i fight for the ones who can't fight
and if i lose at least i tried
we are the new diabolic
we are the bitter bucolic"
by elijah apperson March 30, 2005
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Literally the best way to call someone bad as its one of the best words that also means bad
"Jesus you're a diabolical cunt alright"

Fucking diabolical
by ZINKSWINKS August 27, 2019
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Characteristic of the Devil. Showing ingenuity or wickedness on par with that of Our Dark Lord, the Prince of Lies, Satan. All hail him in his evil glory!
Guy #1: Man, these two diabolical chicks robbed me blind, stole my ride, and then had the audacity to take over the world and enslave humanity! And now they brought on the beginning of the Apocalypse! All hail our accursed masters Deirdre and Sheila.

Guy #2:If you look up 'diabolical' in the dictionary, you'll find a picture of Deirdre and Sheila.
by Ugly Jerry May 13, 2010
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