A small, pet-sized tent for your dog while camping.
Guy 1: You mind if I bring Sparkey on our camping trip this weekend?
Guy 2: No, but he's sleeping in a rigder.

OR

Player 1: r-i-g-d-e-r. Rigder.
Player 2: Dude that's not in the scrabble dictionary.
by dammnn_son April 25, 2011
Get the rigder mug.