by George W. Bush July 9, 2003

Suppose you had a box of marbles that contain 2 sizes of marbles. If 25% of the marbles have the massses of 2.00g each and 75% have the masses of 3.00g each then the average atomic mass would look like this.
(25 marbles x 2.00g = 50g)+(75 marbles x 3.00g = 225g) = 275g / 100 = (an average atomic mass of) 2.75g.
(25 marbles x 2.00g = 50g)+(75 marbles x 3.00g = 225g) = 275g / 100 = (an average atomic mass of) 2.75g.
by Killa Chris the Great September 29, 2006

by tinkerbelll May 22, 2004

A most foul smelling fart that can peel paint from the walls, cause women to faint, small children and animals to die, and clear entire stadiums.
Man, that burrito I ate last night made me drop some WMD's , weapons of mass destrution. Done cleared out the village.
by Bob L July 3, 2003

by Anonymous July 13, 2003

A loose term used to ambiguously declare war on oil-rich nations so George W. Bush can become the universal owner of all oil wells existing on the face of the earth.
Otherwise known as the bullshit we're told exists in order to destroy a nation so my buddy at Halliburton can make millions rebuilding it.
Otherwise known as the bullshit we're told exists in order to destroy a nation so my buddy at Halliburton can make millions rebuilding it.
by globalgirl November 6, 2003

A widely popular phrase of abbreviated words to sound almost nothing like the original meaning:
1) A large (Massive) group gathering (Session) of people with the Y chromosome (Peen); Hanging out; Chillin with the bros.
2) Mass Peen Sesh can also refer either to Gay/homosexual intercourse between many men.
1) A large (Massive) group gathering (Session) of people with the Y chromosome (Peen); Hanging out; Chillin with the bros.
2) Mass Peen Sesh can also refer either to Gay/homosexual intercourse between many men.
Dude, friday we're having a Mass Peen Sesh at joe's for some mad ish.
Mass Peen Sesh at Cinema 10 on Saturday, you comin' bro?
"Okay so likkkeeee were havvingg some mass peen sesh at my houseeeee ;) come with ur toyzzzz!"
Mass Peen Sesh at Cinema 10 on Saturday, you comin' bro?
"Okay so likkkeeee were havvingg some mass peen sesh at my houseeeee ;) come with ur toyzzzz!"
by Phoocakez January 26, 2010
