Blacklist

[Sarah]

To put in a black list as deserving of suspicion, censure, orpunishment; esp. to put in a list of persons stigmatized as insolventor untrustworthy, -- as tradesmen and employers do for mutualprotection; as, to blacklist a workman who has been discharged. SeeBlack list, under Black, a.If you blacklist us, we will boycott you. John Swinton.

[Sarah]

a list of banned or undesirable people

to put someone on a list of banned or undesirable people

[Sarah]

list of other people that african american people collectively want to off, kill, or make disappear.

[Sarah]

To post a misleading link to a YouTube video of Rebecca Black's Friday. Related to [rickroll].

[Justin Bieber]

A blacklist is list of items, such as usernames or IP addresses, that are denied access to a certain system or protocol. When a blacklist is used for access control, all entities are allowed access, except those listed in the blacklist. The opposite of a blacklist is a whitelist, which denies access to all items, except those included in the list.
Blacklists have several applications in computing: