To add money to a cellular phone.
The next time I'm due to top up is April 6th.
by GuidoPosse69 February 22, 2005
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On a certain unnamed Caribbean island (not Jamaica) top up means one who smokes ganja.
Dat white boy ok,how you know him,he top up?
by BSquared June 20, 2007
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When you offer a muffin/dessert to your chubby partner. i.e. partner who has a muffin top.
“Would you like a top up?”
“Would you like a top up for your muffin top?”
by Chechi August 3, 2020
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To have sex with someone.
Damn hommie, when we were topping up last night, I busted 5 times, in a half hour.
by Ta'Lesha March 15, 2007
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The kind of music that you listen to only when the (convertible) top and all windows are up. Also known as 'closet music' it is the kind of music that you don't want anyone to know that you like.
The Black Eyed Peas came on Hits 1, but the top was down so I couldn't listen. BEP is my favourite top up music!
by carterh September 24, 2006
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Doing a poo.

Origin: mix of Australian and Nordic.
“Have you seen Gabs

“Yeah he’s just topping up the myki, so I wouldn’t be going in there for a while”
by JaxCrackers May 14, 2018
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An unofficial form of prostitution where (usually a woman) has money added to her prepaid cellphone in exchange for sex. Used on the island of St. Kitts and possibly other caribbean nations.
"What's up?'
"Oh, not much, my girl dropped by for some top up sex earlier"
"How much did you give her?"
"20 EC"
by Ebonyks December 28, 2010
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