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1. Twash
Corruption of the word "Twat", meaning a womans genitals, also used as an insult. Was first used to insult a Welsh teacher, who put the "-ash" suffix on every word she could, for example "Put thash pencil down!"
In a sexual manner:

"Mark would love to lick Nina's twash, but he has a bird"

As an insult:

"Piss off you twash"
by Chris Apr 8, 2005 add a video
2. twash
Twash, a corruption of the word "twat", meaning a womans genitals or an annoying person.
"fuck off you twash"
or
"you lick her twash"
by GeddyB Feb 24, 2005 add a video
3. Twash
Especially pointless or useless comments made on Twitter; i.e. Twitter + Trash = Twash.
Man, this guy's feed is nothing but Twash.
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