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8.
51
Number of states many people seem to think the USA has.
"The usa has 51 states"
by Pande August 10, 2008
 
1.
51
A joint made of 51% weed and 49% cocaine.
Hey dude let's smoke a 51.
by Hijodelbong August 05, 2005
 
2.
5.1
5.1 refers to the state you are in when you become really loud after a drinking session. The 5.1 originates from the surround sound speaker system and hence you can hear the person from every angle.
1) Easy mate you on a 5.1
2) Turn it down bruv u reachin 5.1
by Silent Assassin June 17, 2005
 
3.
5.1
A type of sound system.
Barlow: Five-point-one is *RIGHT*
by Spi September 28, 2003
 
4.
51
Combination of crack cocaine with marijuana or tobacco
Whats good bro?
Just coolin with a 51
by whodatjcole April 19, 2011
 
5.
5.1
theory of sorround sound for speakers. does not work with headphones.
1. ) "I bought an 5.1 surroundsound headset." "Well Bro that is bullshit. It does not work.!"
by Spankmaster B November 21, 2012
 
6.
51
a very cool number which has absolutely no significance to anything.

often written on various objecs in public spaces, or at least it is among my 'circle'.
"hey, dudes, I just 51-ed that lamp-post"
"really? oh yeah, I can see it now, nice one man"
by cheesepie4herJboy August 19, 2009
 
7.
51
a joint with $1 worth of weed and $5 of freebase.
why don't you roll up a 51, boo.
by gaa barry gary October 03, 2004