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An attempt to take away the shine of others, campaign, cause etc by putting the focus on self or another subject.
I can't believe he shinebombed Tessa when she talked about her struggle as a women.

Rita shinebombed Lauren's scholarship award when she said 'You got the scholarship because affirmative action'(Lauren is Canadian and worked her ass off)

Everyone gave Adam kudos for his idea at the meeting but Bob shinebombed the idea by saying 'That he would have had a better idea if he was given more time'.
by girl with pepper October 22, 2017
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