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2.
A Grech is a derogatory term for a fellow human being, and spends most of his time in a cardboard box with little food. It is considered by several to be one of the harshest insults in the english language.
How many times do I need to tell you, we dont want any grechs like you around here!
by Ellasian February 25, 2005
 
1.
A really, really, ridiculusly unhealthy fat person. It was named after one of the fattest humans currently known to exist. His weight is currently unknown because no scales are strong enough to hold his fatness.
Wow! Ordering another set of wing dings is such a grech thing to do
by David Richard Hauck June 03, 2007