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1.
An individual who has no idea what is going on or someone who always gets in the way. Could also be a person who is a complete tool that wears diamond pattern shirts, gam gam knit sweaters with geese or mountains on them, cords, or painted on jeans.
Man that Sean kid is being a fuckin jig jag. He's always jig jaggin about.

Look at that jig jag.

This guys a jig jag.
by Jim Mahorn August 21, 2008
 
2.
To flap one's arms and/or legs in a vain attempt to catch an object as it is falling; the act of doing this.
Look at that that spaz doing a jigjag---he's such a klutz!
by pentozali July 25, 2011