18 possible answers to
Answers with 3 characters: ERR Answers with 4 characters: BLOW FLUB GOOF HASH MUFF Answers with 5 characters: BONER BOTCH MISDO GUMUP Answers with 6 characters: FOULUP GOOFUP MESSUP BALLUP Answers with 7 characters: LOUSEUP BOTCHUP SCREWUP Answers with 8 characters: BOLLIXUP