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1.
Sexual activities between two people which normally involves getting to 2nd base (hand-jobs, fingering) and/or to 3rd base (blow-jobs, eating out).
Mike and I were only fooling around last night, we didn't actually fuck.
by Kakalak October 30, 2005
 
2.
The act of partaking in activeties with the opposite sex that may "raise an eyebrow" so to speak
Riding in cars with boys, making out, etc...
by Mike Ockislonger April 08, 2005
 
3.
Three definitions:

1. Mock fighting or wrestling, horseplay, slapping, or grab-assing, usually indulged in by immature boys.

2. Adults who evade work responsibility by indulging in tomfoolery or idle socializing when there is work to be done.

3. Current euphemism for "have sex," having replaced "make love" about 25-30 years ago. "Fooling around" connotes sexual foreplay which may or may not lead to deliberate intercourse depending on the couple's tradition and current opportunity.

.
1-"Boys, if you don't stop that fooling around back there, I'm gonna turn this van around and we'll all go home."

2-"The phone was ringing, and where were the front-office employees? In the break room, fooling around as usual."

3-"There's nothing on TV and the kids are asleep. Feel like fooling around?"
.
by al-in-chgo August 18, 2010
 
4.
Making an idiot of oneself. Acting immaturely.
by Kung-Fu Jesus April 30, 2004
 
5.
Having sex with someone for pleasure without a relationship.
They were "fooling around" all night.
by David Blane May 22, 2005