a) Utterly
flabbergasted; pretty much the only way left to say you
ain't got shit to say, akin to the old idiom of shitting one's pants in disbelief or shock, but a wicker
fucking chicken is a tad bit more of an ordeal than just shitting one's pants.
b) Also used to express extreme dopeness.
a) When I saw my bitch's new haircut all
chopped up like a dyke, I about shit a wicker chicken.
b) What!? You got to kick it backstage at Snoop's 420 party!?
Well shit a wicker chicken, nigga!
That's dope!