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When one person goes in for an aggressive kiss and the other goes in for a passionate, gentle kiss. This results in their faces slamming together in unintentional violence.

Occasionally, the two grunt in pain, or in other words growl as a polar bear would.
"My first kiss was a total mess. 100% polar bear kiss. I thought he loved me, but instead he rammed in face into mine."
by Zhmais June 27, 2016
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