Top Definition
(Pronounced seen-by)

The act of trembling one's head while gradually closing their eyes and opening up their lips to a tight-cheek smile. Facing the sunlight while doing this action is optional.

Often done when recalling a funny memory.
"Whenever I remember my brother's head getting stuck in the toilet, I do a seanbi."
by lover of cum January 17, 2009
5 Words related to Seanbi

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