Walking around with your scrotum hanging out and intentionally exposed. Usually through an open fly.
During rush week, several frats required dandi-balls of their pledges.

I was so drunk last night at the Christmas party I walked around with dandi-balls. I have a meeting at 2 pm today with Human Resources. Wonder what that’s about?
by Eaton Holgoode December 11, 2018
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Having sex in front of cameras
Did you hear Marie and Ben had dandy sex in the locker room at Lab?
by I <3 Marie January 23, 2005
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to use one's scrotum to hit another man's scrotum. often associated with 'jousting'
"Did you hear Bill? Last night Tom drank piss, so Andy Dandy Slapped him and then spat in his eye. What a mess"
by FM104 August 23, 2007
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said sarcastically when something bad happens.
Bob: I got a 54 on my math test. Fuckin JIM DANDY, huh?
by E-Stylee November 8, 2005
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50's slang for receiving a blow job.
Hey Hun, thanks for the swell martini. How about a terrific mouth dandy?
by GuppyUnit August 22, 2012
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A person who crushes up lollipops and snorts it to get a sugar rush causing them to act crazy and happy.
Yo I snorted a lot of crushed lollipops I feel like a dandy lolly.
by slowbucks December 2, 2016
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