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1.
Verb:

1.to fail to show up for an important date, ditch someone

2.making up bull excuses inorder to get out of trouble or serious situations.
1.'Hey, did you meet up with Jack?'
'no, the jerk bailed on me.'

2.'gosh, i really needed to talk to her but she bailed on me!'
by Anti_Social October 02, 2005
 
2.
To fall over
Ha you Bailed!
by Dave Hill June 04, 2003