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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.
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.