Like a rat up a drainpipe Share definition Flag To copulate with a female shortly after meeting her. "Jason rooted Kylie on their first date - he was like a rat up a drainpipe!" Like a rat up a drainpipe by dluth December 13, 2008 0 0 Get merch Get the Like a rat up a drainpipe mug. Buy Now — $32.95 See more merch