to be stupid or retarded. An adult who acts like a child
Throwing a tantrum in the middle of a party is sonistic of you.
by barcelona123 May 15, 2012
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An.ass-maniac.who.rapidly.fucks.her mate's ass,enough for friction to set in.
"If you know a kind of person like that,he's probably an Arse-sonist"
by sir mix-alot September 4, 2007
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