A man who has renounced all of his man points and respect in consequence to his utter obsession with a girl. The term can also be applied as a verb; to squeel, squeelering. A squeeler is the epitomy of a pussy-whipped pansy and the transition from man to squeeler is often devastating for any former friends of said squeeler.
A: 'Mate, you wanna go for a drink and start some fights?'
B: 'No, I'm waiting for a phonecall from Rachel.'