O'Lester 

To use Listerine as a lubricant will giving someone a rim job so as to avoid the bad taste of the person's rim.

After giving Charlie the old O'Lester, Oliver didn't mind the taste of her anus.

O'Lester by RuiMing August 12, 2010

letter O 

when you wanna make fun of your bestfriend/friend but theres nothing to make fun of you say they look like the letter O

friend 1: hey
friend 2 : nigga you look like the letter O

letter O by aclownclownclown January 3, 2020