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Same definition as a wetty (or wet blanket), only a spelling error gave rise to an altered version. A weety (Wetty) is a person who dampens the tone and/or persistently declines requests to go out on social excursions to which they have been invited. More commonly, weety and wetty have been used after just one such instance or over a simple refusal to do something they are asked.

Pronounced Whee-tee
"Fucking weety (Wheaty), we asked you last week to come along!"

"That guy is such a weety, I think he might be wholegrain"

"Hey Martin, frape this guy and call him a wetty for not showing", "Oh, you rushed and put weety, that works too".
by TPH Warpath November 23, 2011