The Collaborative International Dictionary of English v.0.48:

goof off \goof off\ v. i.
   To shirk one's duties; to avoid work by relaxing or
   performing idle activities. [Informal]
   [PJC]

Moby Thesaurus II by Grady Ward, 1.0:

127 Moby Thesaurus words for "goof off":
   abandon, bum, bum around, bungler, clock watcher, cut, dallier,
   dally, dawdle, dawdler, delay, diddler, dillydallier, dillydally,
   disregarder, do nothing, do-nothing, dodge, dodger, dog it,
   dolittle, doodler, drag, drone, duck, duck duty, faineant, falter,
   flag, foot-dragger, gentleman of leisure, get out of, goldbrick,
   goldbricker, halt, hang around, idle, idler, ignorer, jump, lag,
   laggard, laze, lazy, leave, leave loose ends, leave undone,
   let alone, let be, let dangle, let go, lie around, lie-abed,
   linger, lingerer, loaf, loafer, loiter, loiter about, loiterer,
   loll, loll around, loller, lollop around, lollygag, lotus-eater,
   lounge, lounge around, lounger, lubber, malinger, malingerer, miss,
   mooch around, moon, moon around, mope, moper, neglecter, negligent,
   not pull fair, omit, pass over, pass up, plodder, potterer,
   pretermit, procrastinate, procrastinator, putterer, shilly-shally,
   shirk, shirker, sit around, skip, skulk, slack, slacker,
   sleepyhead, slide out of, slip out of, slouch, slouch around,
   sloucher, sloven, slow goer, slow-foot, slowbelly, slowpoke, slug,
   sluggard, slut, snail, sneak out of, soldier, stand around,
   stick-in-the-mud, tarry, time killer, time waster, tortoise, trail,
   trifle, trifler, waiter on Providence, waste time, welsh