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Letho is the abbreviation for "Lethargic", and means "lazy".
Person A: "Sup?"
Person B: "Letho."
Letho by Husky Xing January 13, 2013
The love between Jared Leto and Shannon Leto of rock band Thirty Seconds To Mars in fanfiction.

Derived from the combination of their last name, "Leto" and the word "incest."
Warning: This fanfic contains slash, swearing, and letocest!
letocest by Michelle Nelson January 19, 2007

Lunchbox Letdown 

A frustrating situation when after feeding a guy booze and listening to him talk about himself all night at the bar, you get him home and as you take off his pants you're dissapointed to find that he has a teeny tiny penis.
Steve: "I thought I'd picked up a good fuck for the night then I suffered Lunchbox Letdown."

Kyle: "I hate that!"

Steve: "It was tiny AND crooked, fucksakes."
Lunchbox Letdown by jdiddy77 February 6, 2012

Chat Lethal 

When finishing an opponent in Hearthstone, assume that every card costs 0 mana, opponent has no taunts or secrets, all spells and abilities can hit face, all minions have charge and immune to silence/freeze, and that arithmetically 2+2=9.
Retard #1: "OMFG KRIPP SO BAD MISSED LETHAL"
Retard #2: "wtf why hit senjin and not wrath+starfall face?"
Retard #3: "WOW LETHAL MISSED"
Guy #1: "he only had 3 mana... chat lethal"
Retard #4: "have you noticed children's pee smells like turnips?"
Chat Lethal by Ryaii March 7, 2014
Love and passion personified into a single human being. When compassion, intelligence, wit, empathy, warmth, sensuality, fire, creativity, vision, magic, and a small amount of unicorn dust is combined into a single perfect soul.
I've met the man I'm going to marry. He's everything to me and the world's most perfect man. He's my Leto.
Leto by ecams November 22, 2010

Shannon Leto

The most kickass drummer ever of the band, 30 Seconds to Mars. And oh yeah...he's hot. Also the older brother of Jared Leto.
Shannon Leto is amazing. If you disagree, whatev.
Shannon Leto by Liann September 4, 2008