Parking a custard Share definition Flag being sick in a defined place. Either at the side of the road, or a toilet, sink etc. "Dude where is Bill?" "he didnt feel well, hes in the toilet parking a custard!" Parking a custard by Tattoo'd Ed August 28, 2009 0 0 Get merch Get the Parking a custard mug. Buy Now — $32.95 See more merch