A guy or girl who kisses somebody's behind for the purpose of gaining what they want. Usually related to money, opportunities, media exposure and for the purpose of dating. Thirst meaning they are salivating over the person or object. Bucket is what the saliva drops into. The combination is a disgusting Thirst filled bucket and that describes the behavior: Gross.
John looks like a thirstbucket chasing a girl that doesn't want him.
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The combination of being average looking and having a bad attitude. Emphasis on the attitude portion.
Guy: Isn't my girl hot?
Friend: Bro she's butthefuck!