What is the meaning of Perk?

Perquisite.

A bonus ability that a player character can acquire; a permanent power-up.

To make (coffee) in a percolator or a drip coffeemaker.

Of coffee: to be produced by heated water seeping (“percolating”) through coffee grounds.

A percolator, particularly of coffee.

To make trim or smart; to straighten up; to erect; to make a jaunty or saucy display of.

To appear from below or behind something, emerge, pop up, poke out.

To exalt oneself; to bear oneself loftily.

Smart; trim; spruce; jaunty; vain.

To peer; to look narrowly, sharply, or inquisitively.

To examine thoroughly.

To perch.

a delimited piece of ground, e.g. a flowerbed

Source: wiktionary.org