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A 2nd Lieutenant in US Armed Forces, specifically the Marine Corps. "Butterbar", a reference to the gold bar rank insignia worn on the uniform, is a term generally used in a condescending or patronizing manner towards a boot lieutanant that thinks he knows everything, yet couldn't lead the way out of his own ass with a map and flashlight.

After completing OCS (Officer Candidate School) and TBS (The Basic School) a large number of newly minted butter bars tend to think that they are Chesty Puller and General Patton reincarnated and have the belief that after months of schooling they know much more than enlisted Marines that have been doing the job much longer.

Some have been so stupid as to actually stop a Gunner (THE Man in the USMC) or a Sergeant Major and demand a salute. Several pounds of flesh and ego are stripped before the Lt. knows what is happening and before you know it he's standing locked at point of attention like a fatbody at chowtime.

After several years of seasoning, and realizing that PT studliness doesn't make them a great leader, the butter bar becomes a 1st. Lt. and usually has a clue by then.
Phrases often heard from a Butterbar:

"In my experience..."

"It would behoove you..." (an attempt to sound salty or like a senior enlisted)

"We need to execute gents. We need to execute or we'll be in a $hit sandwich" (repeats every chances he gets, simply because he likes the way it sounds.)
Butterbar by Salusa March 1, 2008

butterbacker 

A football player who would be considered as someone overweight if they had not been a football player.
Johnny: "Man, that Herman Johnson is such a butterbacker!"
Li'l Spicy: "True dat, true dat."
butterbacker by Zorgithatoob November 30, 2010

Butterball Buttfuck

Engaging in anal sex with a butterball (A morbidly obese person) This can result in extreme depression, suicidal thoughts, loss of hearing, sight, and in some extreme cases: losing the ability to feel anything.
Friend 1:Did you hear what craig did?
Friend 2: No what did he do?
Friend 1: He butterball buttfucked Lisa last night!
Friend 2: Ew thats gross man!
Butterball Buttfuck by Jfeldster December 16, 2011

Butterball Naked

After her shower, Katie was butterball naked.
Butterball Naked by Va5oh November 2, 2016

Butterball Effect 

A scientific theory which explains that regularly eating butter, even a small pat, will eventually turn you into a fat butterball.
At the 10 year High School Reunion.....

Gerard: Hey check out Sylvia, she's a total hefer! She used to be hot, what happened?

Chuck: Dude, It's called the Butterball Effect, all those empty fat calories have wreaked their damnable havoc on her once fine physique.

Gerard: Say what now?
Butterball Effect by Mr. Softey January 25, 2009

Truffle Butter Baby 

The result of being conceived although your dad finished in your mom's ass. He went butt, pussy, butt, pusyy, butt, creating a large amount of extra dark, extra chunky truffle Butter. Your dad eventually came, but the truffle butter was to much and somehow you rose from the filth.
Baller and knotts are truffle butter baby twins. They momma was nastyyy.