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1.
The chant used by Anette Olzon, lead singer of Finnish symphonic band Nightwish, to get the audience into songs. It originally started out as simply "HEY!" but it soon morphed into her iconic HEP HEPs!
Formed from the HEP HEPs, there is a HEP HEP Army, which is joined by simply chanting "HEP! HEP! HEP! HEP!" during an appropriate time in a Nightwish song.
"Ok, HEP! HEP! HEP! HEP!"
"And one more time, come on and HEP! HEP!"
"I went to a Nightwish concert last night: I joined the HEP HEP Army!"
"I love Anette's HEP HEPs: they really get the audience going!"
by QFNWM July 10, 2009
 
2.
male jail bait
That guy is a hep-hep, be careful.
by heps February 01, 2011