round the bend

from WordNet (r) 3.0 (2006)
round the bend
    adj 1: informal or slang terms for mentally irregular; "it used
           to drive my husband balmy" [syn: {balmy}, {barmy},
           {bats}, {batty}, {bonkers}, {buggy}, {cracked},
           {crackers}, {daft}, {dotty}, {fruity}, {haywire},
           {kooky}, {kookie}, {loco}, {loony}, {loopy}, {nuts},
           {nutty}, {round the bend}, {around the bend}, {wacky},
           {whacky}]