Abacus

An instrument used to calculate numbers and other mathematical problems, which is 10 times better and faster than calculator.

Abacus vs. Calculator, who wins?
Abacus, of course!

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bieber sweat

A secret ingredient used in Justin Bieber's new fragrance, Girlfriend.

David Letterman: Uh uh your young female..... (holding a bottle of perfume "Girlfriend")
Justin Bieber: Secret ingredient! Bieber sweat!

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asstray

Anything that lets you sit (chair, couch, etc.) is called asstray after you get up from it. Because the seat becomes hot after you sit on it for a long period. It is a blend of ass and ashtray (ashtray is hot as people drop the ashes of cigarettes into an ashtray).

(In a bus...)
Young man: Come ma'am. You can have my seat.
Old lady: No, thanks. I do not want my bum to get roasted by the asstray.

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LaB

Abbreviation of Lazy and Busy. One will snap at someone else who is asking for assistance by saying LaB (pronounced with the initials) immediately if he/she is reluctant to help.

It could mean that you're simply too busy or just too lazy to help.

Renee: Can you please help me with this experiment, Sebastian?

Sebastian: Sorry. LaB.