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A buttsnag refers to anything that sucks and prevents you from enjoying the fullness of a moment, gets in the way of productivity or negatively effects you.

For example, your computer crashing is a major #butsnag.

- or -

A person who complains constantly or just gets gross wasted and ruins a night is a total #butsnag.
Dan could be a real buttsnag of a boss, always sipping from the jagger he kept in his desk and raging randomly at his employees.
by Spollock September 02, 2016
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