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1.
To take delight in anothers folly usually for a period of several seconds or more.
I'm gonna goof on this wino who's trying to tie his shoes while he's drunk.
by juancabeza August 30, 2009
 
2.
to deliberately choose to spend time on something not particularly important
Chris Young is already enjoying the day off. Been reading on my front porch, recording videos, and just goofing off in general. Later on I plan to goof on in particular ways.
by Una Malachica July 17, 2009