shout out

Short definition from Wiktionary

Verb

1. 1
   To publicly greet or acknowledge a person, group, or organization.
2. 2
   To speak when inappropriate, particularly in a school environment.

Noun

1. 1
   Misspelling of shout-out.
2. 2
   An unscripted mention of the name of a viewer or audience member when on stage, television, etc.
3. 3
   A section of a web page, profile or blog containing these greetings.