Rock Robster Share definition Flag The act of cumming all over your partners hands while she yells out "I am the Robster, Coo-Coo-Ca-Choo!" I gave your sister a Rock Robster last night and she still hasn't washed her hands. Rock Robster by Rock Robster January 23, 2009 0 0 Get merch Get the Rock Robster mug. Buy Now — $32.95 See more merch