Top Definition
The opposite of overboard; not enough of something or some kind of extreme lack of something.
Mom: Beth Ann, don't go underboard on your school work with your texting!

Beth Ann: OMGINBD!
#underboard #overboard #lack #slacker #idkmybffjill #cingular #at&t
by Sid Barrett February 15, 2009
8 Words related to Underboard
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