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1.
One who spits saliva while talking and becomes aggressive after consuming a large intake of alcohol, generally watching football matches. Loves an alcohol fuelled fight (men or women included).
John - I got barred last night from my local public house while watching the football!!!
Dave - Why? What did you do?
John - I did a "sweeny"!
Dave - You clown! How long are you barred for?
John - For life!!
by REL74 February 11, 2010
 
2.
When a male gets hit so hard in the testicles by someone else's hand that they are in pain for next few days.
Man 1: *Slaps man 2*
Man 2: *Delivers sweeny to man 1*
Man 1: *dies*
Man 2: "rofl pwned!:
by Assassin Mr X November 18, 2007