a grotesque, fantastic, or ludicrous gesture, act, or posture.
2.
Archaic.
a.
an actor in a grotesque or ridiculous presentation.
b.
a buffoon; clown.
3.
Obsolete.
a.
a grotesque theatrical presentation; ridiculous interlude.
b.
a grotesque or fantastic sculptured figure, as a gargoyle.
–adjective
4.
ludicrous; funny.
5.
fantastic; odd; grotesque: an antic disposition.
–verb (used without object)
6.
Obsolete. to perform antics; caper.
Origin: 1520–30; earlier antike,antique < It antico ancient (< L antīcus, antīquus;see antique), appar. taken to mean “grotesque,” as used in descriptions of fantastic figures found in Roman ruins
[an-tik] 
noun, adjective, verb, -ticked, -tick⋅ing.