Answer:

holla

AnswerCrossword Clue
HOLLA"... atcha boy!"
HOLLAHans Brinker's home
HOLLAHey!
HOLLAExclamation to call attention.
HOLLAShout to the hounds, in hunting.
HOLLAAttention-getting call.
HOLLAExultant shout
HOLLASay hi, in modern lingo
HOLLASay hi, in modern slang
HOLLAModern version of "Hey there!"
HOLLAShouted casual greeting