Guys, Can high fives be a sign of flirting?

Amber1799
Constantly this guy gives me high fives pretty much everyday whlist on the college coach. Whenever we have something in common or agree with something he asks for a high five. This one time i said no and rejected his high five and he was like "awh" and looked sad, i did it as a joke obviously. But anyway can high fives be a sign of flirting?
Guys, Can high fives be a sign of flirting?
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