Back-seat Chiller Share definition Flag <n> term given to a chav who has "baggsed" the back seat of a bus to "chill" Lloyd: "Oi mate lets bags the back seat and be Back-seat Chillers" Back-seat Chiller by nomis1984 May 29, 2009 0 0 Get merch Get the Back-seat Chiller mug. Buy Now — $32.95 See more merch