gaspagoo Share definition Flag A Cajun word for a big, mean, ugly catfish. Them what will take your fingers always taste best. Don't you go noodlin' up up Saintlake way, boy, there's a gaspagoo will have your thumbs quicksmart. gaspagoo by odellgraff March 7, 2007 0 0 Get merch Get the gaspagoo mug. Buy Now — $32.95 See more merch