1) When you
tuck your
shirt back into your pants after just having shat (taken a shit).
2) One of the main streets in Berkeley, CA.
Buddy: "Isn't it
weird how Berkeley named its main street after the act of rearranging your clothing after taking a shit?"
Guy: "Not
weird at all. When you walk down the street you're guaranteed to see at least
one bum pooping out in the open, so seeing a shattuck is pretty common on Shattuck Ave."