Where you Cheerios are placed in the anal crevice of a consenting sexual partner.
The other partner then licks the cereal items from their area, thusly performing a Cheerio Rimmer.
Barry gave me the best Cheerio Rimmer last night.
When you wipe to the point of bleeding.
Dude! Can you buy a new brand of toilet paper!? I'm giving myself a red rimmer every other shit.
When a cigar is incorrectly light and causes the cigar to burn uneven, offset or only on one side.
Your cigar has a Rimmer Dimmer! You didn’t light your cigar properly, you have a dimmer dimmer going.