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The act of taking advantage of another person's good fortune, opportunity, ammenity or planned activity without monetary, physical or other contribution. Often the victims tolerate or invite the offense due to friendship or familial loyalty, and in most cases the perpetrator is a self-admitted/shameless opportunist.
I don't have a club membership, my sister lets me glomm on to hers.

He's always glomming on to everyone's food and never brings anything to add to the cookout.

She never leads the paceline when we cycle, she just gets in line and drafts, glomming on to everyone else's effort.
by SteelBldgLady August 19, 2011
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