tons o' fun 

a grotesquely obese female that makes for a good hit and run because of her zealous eagerness to please

I'm sore from digging out that tons o' fun last night.

tons o' fun by Herb N. Dictionary October 25, 2002

tons-o-fun 

A quantitative measurement of fun dealing with an amount of fun that is over 2000 pounds or more. Usually used sarcastically.

I told Megan that talking to Doug and Josh sounded like tons-o-fun.

tons-o-fun by Matt March 9, 2005

Tons-o-fun 

A large or morbidly obese woman.

Hey dude check her out, she'd be tons-o-fun in bed !!

Tons-o-fun by shomesomethin July 13, 2010