Say hi, in modern lingo

• Give a casual greeting, in modern lingo
• Shout-out word
• Shouted casual greeting
• Exclamation to call attention
• Say hi, in slang
• Exultant shout

Wikipedia Word definitions in Wikipedia
Holla may refer to:

WordNet Word definitions in WordNet
n. a very loud utterance (like the sound of an animal); "his bellow filled the hallway" [syn: bellow , bellowing , holler , hollering , hollo , holloa , roar , roaring , yowl ]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Holla \Hol"la\, interj. [F. hola; ho ho + l[`a] there, fr. L. illac that way, there. Cf. Hollo .] Hollo.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
as a command to "stop, cease," 1520s, from French holà (15c.). As a command to get attention, from 1580s. As an urban slang form of holler (v.) and meaning "greet, shout out to," it was in use by 2003.