A golden toothbrush is the result of dipping a roommate, sister, brother, or friend's toothbrush in the toilet after you have urinated in the bowl.
I was so angry at my roomate that I urinated in the toilet and then dipped his toothbrush in the toliet water. I gave him a real golden toothbrush and could not help laughing when he brushed his teeth the next morning.
by Ron the avenger October 8, 2011
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