To Insert ones penis into anothers belly button and thrust.
- OMFG, that boy ruairi had a belly bash with his boyfriend casp, just before they had a Rosher.
- Thats just freaky dude.
- I know.
by River Fraser April 20, 2008
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When a woman lays on her stomach in bed and pleasures herself.
"I thought my girlfriend was asleep but when I heard her moan I knew she was belly bashing"
by halfmanhalfamazing March 4, 2015
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