Wildcard

[Gregory]

In computing, a wildcard refers to a character that can be substituted for zero or more characters in a string. Wildcards are commonly used in computer programming, database SQL search queries, and when navigating through DOS or Unix directories via the command prompt.
Below are some popular uses for wildcards:

[Lanell]

A person who is generally [unpredictable] and has no defined role in a group of friends, and their often [reckless] and [wacky] behavior can either benefit or hurt the group depending on the situation.

[Monty]

The action of taking multiple [dicks up] [the ass] [at once]. Only men can be wildcarded.

[Dave Paprocki]

a girl who is [unpredictable] but fun. The life of the parties but never easy. Everyone wants her, but she cant be [held down]. You [never know] what to expect!

[Dianne]

In poker, [a card] which can be assigned any value the [cardholder] wishes.
An factor affecting events in an unknown or [unpredictable] fashion.
In sports, usually a playoff spot available to a team that does not finish first in their division or league.

[Jason Yan]

a wildcard in computer world is eg. *?

a * usually represents [zero] or more any characters, numbers etc, and a ? means any 1 character, number etc.
theyre used to denote many [files], or search for something (called [glob] searching)

[Magaret]

[a card] in [games] that can be used as another [amount].

[Sarah]

A playing card that can have any value, suit, colour, or other property in a game at the discretion of the player holding it.