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1.
A narcissistic person who is better at anything in life than everyone else usually due to playing with themself way more than normal
Davo: "Why does billy think he's better than everyone else all the time?"

Danno: "Cause the fuckheads a serial masturbator"
by mickeeey July 05, 2009
 
2.
A chap who masturbates way more than usuall. normally found pulling one off into house hold items, such as: sink, shower, toilet or jam jar.
Jeff: Whats jack doing these days?

Rupert: Ahh he's being a serial masturbator somewhere!

Jeff: now I'm dark on him aye.
by BigJay! November 13, 2011