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2.
Unflattering nickname for someone with extremely bad breath that fairly accurately replicates the foul odors that are more commonly emitted from the rectum.
Worker 1: "Now, when ever rectum breath comes over to ask me something, I automatically shut down my nose and breathe very carefully out of my mouth."

Worker 2: "I hear that!"
by BamKablam September 15, 2011
 
1.
What you'd call someone face-to-face if their breath smells as if they've been sticking their tongue up someone else's rectum, particularly if you don't like them.
Don't bother having a conversation with me rectum breath!
by fuckinqueenslander June 15, 2008