1. literally: caribbean (especially trini) slang for buttocks, ass, bottom, backside.

2. figuratively: caribbean (especially trini) slang for a loser. but when you call someone a bamsee you are not usually very annoyed with them or anything, it is kind of a light hearted way of describing loser behaviour. if you really want to call someone out, you are more likely to call them a cunt. school children are more often heard calling each other bamsees than anyone else, but bamsee is still standard slang for everybody.
carrie-ann you is one bamsee eh? ah tell yuh doh mash mih foot when yuh walking and yuh mash mih foot again. oh gorm, gyul. you is a real bamsee.

also...

oh shit boy yuh see di bamsee on carrie-ann? dat gyul have bottom fuh so. ah want to wine up on dat bamsee whole night!
by mikoism October 11, 2006
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A person who's always following you everywhere...... they're right on your back everytime you turn around. The Slang is use in the west indies.... especially in Trinidad and Tobago.....when the person becomes very annoying.
You know like when u watch a horse or a cow there are always flies buzzing around its butt..... righ, just like that.
Boy go from here na!!.... u like a rel bamsee fly. Find somewhere to go.... leave me alone.
by Anthon June 30, 2006
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Sit your bamsee down here right now child!
by DantéiKillaz December 3, 2021
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