What does the phrase "pull off sick wheelies and flips" mean here?

Question

Here is a made-up sentence from a racing game:

In order to earn speed boosts, you should catch air and pull off sick wheelies and flips.

I am not sure about the meaning of the phrase "pull off sick wheelies and flips."

I know the meaning of the word wheelie, but cannot figure out the sense of the word sick. Also, I am not sure if the word flip conveys an act in air or on land.

Answer 1

pull off sick wheelies and flips.

To pull off something is a phrasal verb. ("Pull off" is used together.) Here it means:

to succeed in doing something difficult or unexpected.

--- Cambridge Dictionary

The word sick is slang used by young people:

(slang) very good, excellent:

snowboarders doing sick tricks

--- Cambridge Dictionary

As user @JamesK notes, it may be considered dated. (Teenage slang moves pretty fast.)

A wheelie or wheelstand is a trick where the front wheel of a bicycle or a motorcycle comes off the ground:

--- Photo: AngMoKio, Wikipedia

And finally, a flip is another kind of trick, where either the person, or their equipment, flips over.

This can be on a motorcycle, a bike, or a skateboard, for example:

-- Photo by Kirk Morales, Wikimedia Commons

For more reading on skateboarding flips, try the articles Kickflip and Flip tricks on Wikipedia. For bicycle (BMX) tricks, try Freestyle BMX on Wikipedia.

Answer 2

It is casual teen slang.

"Sick" means "very good" (wikitionary sense 6)

"Flip" is some kind of trick in which you rotate in the air.

Using "sick" in this way is, perhaps, already a little dated.