Bleh is a word commonly used by ATV users/riders. This word is worldly known as "Would You Like To Go Quadding/Riding/ATVing". People often refer it was Quadding/Atving/Riding. This word has recently been added to the "popular" lingo, and I guess if your cool, you will get others to use this aswell.
Nick: Bleh Friday?
Devon: Nah Man Im In Hawaii And I Cant Quad with you now.