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1.
A knife / blade weapon

Derives from Jamaican patois, often confused with Leng (firearm/gun)
Allow that boy man, he's packin a skeng

Draw fi skeng man, slice n dice
de Doobsh 17 juillet 2005
 
2.
Ugly, not fit, opposite of peng
That girl is skeng bruv
de Ipswich HXC 2 juillet 2009
 
3.
A gun. or firearm of some sort
oi dem boys got skengs on dem!
de Aztec 10 novembre 2003