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An annoying and burdensome, but important responsibility or concern that is hovering over you that you have to bear and deal with, albeit begrudgingly.
Yea, I can't go out tonight, I got a shitload of homework riding on my ass.

My job is so stressful because of all the big clients I got riding on my ass.
by Ponsonby Britt December 05, 2010
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