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Methionylthreonylthreonylglutaminylarginyltyrosylglutamylserylleucylphenylalanylalanylglutaminylleuc 

yllysylglutamylarginyllysylglutamylglycylalanylphenylalanylvalylprolylphenylalanylvalylthreonylleucylgl
ycylaspartylprolylglycylisoleucylglutamylglutaminylserylleucyllysylisoleucylaspartylthreonylleucylisoleu
cylglutamylalanylglycylalanylaspartylalanylleucylglutamylleucylglycylisoleucylprolylphenylalanylseryla
spartylprolylleucylalanylaspartylglycylprolylthreonylisoleucylglutaminylasparaginylalanylthreonylleucyl
arginylalanylphenylalanylalanylalanylglycylvalylthreonylprolylalanylglutaminylcysteinylphenylalanylglu
tamylmethionylleucylalanylleucylisoleucylarginylglutaminyllysylhistidylprolylthreonylisoleucylprolylisol
eucylglycylleucylleucylmethionyltyrosylalanylasparaginylleucylvalylphenylalanylasparaginyllysylglycyli
soleucylaspartylglutamylphenylalanyltyrosylalanylglutaminylcysteinylglutamyllysylvalylglycylvalylaspa
rtylserylvalylleucylvalylalanylaspartylvalylprolylvalylglutaminylglutamylserylalanylprolylphenylalanylarg
inylglutaminylalanylalanylleucylarginylhistidylasparaginylvalylalanylprolylisoleucylphenylalanylisoleuc

To make the longest word on urbandictionary.com i would need to fill out 127 word forms but im too retarded and lazy
Guy 1: Holy shit did you heat about Titin?!
Guy 2: You mean Methionylthreonylthreonylglutaminylarginyltyrosylglutamylserylleucylphenylalanylalanylglutaminylleuc?

methionylglutaminylarginyltyrosylglutamylserylleucylphenylal anylalanylglutaminylleucyllysylglutamylarginyllysylglutamylg lycylalanylphenylalanylvalylprolylphenylalanylyalylthreonyll eucylglycylaspartylprolylglycylisoleucylglutamylglutaminylse rylleucylly 

This 1913 letter word is the longest word in the English language and is the chemical name for tryptophan synthetase A protein. It appears in Mrs Byrne's Dictionary of Unusual, Obscure and Preposterous Words.
Haha. Yeah right.
METHICO is the new name for MEXICO.
All the good shit is made in METHICO.
METHICO by c_a_b April 29, 2009

Methionylthreonylthreonylglutaminylarginyl...isoleucine 

The longest known word in English, at 189,819 letters, is the chemical name of titin. Titin is the largest known protein. This word takes roughly 3 hours to pronounce.
I can't use the full chemical name of titin because it goes over the word limit. So heres a shortened form:
I just learned today that Methionylthreonylthreonylglutaminylarginyl...isoleucine is the chemical name of the largest known protein to mankind.

mernicorn 

A species that is half mermaid and half unicorn
That mernicorn has a tail and a horn!

Mernicorns are a disgrace to mermaids and unicorns.
mernicorn by Mernicorn Noor December 19, 2012

METHIONYLTHREONYLTHREONYGLUTAMINYLARGINYL 

The shorter and longer way of saying Titin. Titin is short for a chemical name.
Lol, METHIONYLTHREONYLTHREONYGLUTAMINYLARGINYL is short and long for the word Titin.