look up any word, like lemonparty:
 
1.
someone who is cruel, evil, pitiless, merciless, and that never ceases to be bad to others. (the jails are full of these people).
Gee my boss at the moment is so relentless, we should put a hit on that puto, hey H Bomba you got his ticket esse, Orale!!
by Jason "Vato Loco" June 26, 2007
 
2.
A fruit energy drink, high in caffeine. Add pro-plus and a bit of vodka, you'll be bouncing off walls in no time.
Hey did you just see Jimmy!? He downed a relentless cocktail of pro-plus and caffeine, then he jumped out of the window thinking he could fly!
by Black44 December 29, 2007
 
3.
An energy drink, mostly drunk by BMX ers in Farborough. Nornally gone on halves, two people buying a four pack paying half each, and a great drink to replace Red Bull
Guy1"Wanna go asda?"
Guy2"Yeah, wanna go halves on a four pack of Relentless?"
by Roman1077 December 13, 2007
 
4.
Sexually excited. So called because the energy drink Relentless increases your sex drive.
Oh my god. I'm relentless. I need to go abuse myself.
by i-feed-on-your-viscera August 28, 2008
 
5.
Sexually excited. So called because the energy drink Relentless makes you hornier.
Omg. I'm relentless. I need to go abuse myself.
by Adrenalectomised(Hello Wolf!!) August 26, 2008
 
6.
Sexually aroused, so called because the energy drink Relentless makes you hornier.
Omg, I'm relentless...I need to go abuse myself
by Adrenalectomised (HELLO WOLF!) August 17, 2008