(a)To be in agreement with.
(b)To get wasted (to shibby).
(c)An exclamation that one...exclaims when one finds something rediculously cool (works best when used in an dramatic, opera singer-like voice).
(a) Jesse- Dude, let's go get our 'special gifts' from the twins!
Chester- Shibby!

(b) Jesse- Dude, maybe we need to cut back on the shibbying.
Chester- ::slap::

(c) Chester- Dude, you just touched Christy Boner's hoo-hoos!
Jesse- Shibbyyyy! (Opera voice)
by MAMANESE April 3, 2005
Get the shibby, to shibby mug.