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The act of hitting or tapping yourself or others on the head with a newly emptied, soft-sided water bottle (like the bottles used by Aquafina or Dasani). This usually occurs when you are relaxed and just hanging out.
I finished up my water and gave myself an aquabonk, and then aquabonked the dog a few times before getting back to watching Jerry Springer.
by OffroadGirl December 01, 2005
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