An expression of approval that conveys the unwavering and commanding presence of actor William Shatner, particularly for his portrayals of Captain James Tiberius Kirk on the original Star Trek television series and T.J. Hooker on the police-drama television series of the same name.
It's like Scotty beamed down the words "cool," "awesome," "bitchin," "sick," "ill," "groovy" and "sweet" and combined them into one super-powered endorsement of awe and wonder.
"That show last night was shat!"
"Shat beans, bro."
"Nothing ever seems to raise his ire or get his dander up. He's got to be the shattest man I've ever met."