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1.
Also commonly used in Merseyside to describe an underacheiver, with no friends, no ambition, no job, but who often has illusions that he is someone or thinks he's important.
Look at fat Eddie with his new suit on. He's trying to look important but he's just a no mark.His last job was milk monitor in first grade.
by PWD July 02, 2006
 
2.
First heard in Manchester in the early 90's a NO MARK is a man who is mediocre and not a sucess in life. One who has left "no mark" on the world
"Get a better car and get a girlfriend you no mark
by DanTheMan123 June 23, 2004