A catch-all term used to describe undesirables in the South Wales area. This is due to a large proportion of said undesirables hailing from places beginning with the prefix 'Ton', e.g., Tonypandy, Tongwynlais etc.

Features of the tonna include diamond stud earrings, fake tans, bleached hair, a love of cheap cider and trance music.

'That tonna is loving that Cascada tune'

'That tonna just started on me for no reason'

'Those shoes make you look like a tonna'
by louter May 19, 2008
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