After stroking your shaft, you squeeze the tip untill it turns bright red filling with blood while exploding into your own mouth. Then quoting gonavy.com
I really need a shattuck tonight. Go shattuck yourself.
1) When you tuck your shirt back into your pants after just having shat (taken a shit).
2) One of the mainstreets 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."