curn
A term used in spam emails in place of "cum". It is used because it visually looks like the word "cum", but it isn't caught by most spam filters.
To: undisclosed recipients
Subject: Curn like a porn star.
-------- or ---------
To: undisclosed recipients
Subject: Your girlfriend says you curn to quickly
Subject: Curn like a porn star.
-------- or ---------
To: undisclosed recipients
Subject: Your girlfriend says you curn to quickly
Get the curn mug.