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All answers having "Get outta here!" as clue:

3 Character Answers:

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RHO

RUN

SAC



4 Character Answers:

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CMON

SCAT

SHOO



5 Character Answers:

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LEAVE

PSHAW

SCOOT

SCRAM



6 Character Answers:

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BEATIT

GOHOME



7 Character Answers:

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VAMOOSE



14 Character Answers:

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HITTHEROADJACK

YOUREKIDDINGME



15 Character Answers:

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AREYOUKIDDINGME

GOHIDESOMEWHERE

GOJUMPINTHELAKE

YOUMUSTBEJOKING

YOURMOMSCALLING