Mika uses this term in his song "Lollipop" on the album Life in Cartoon Motion.

"I went walking with my momma one day
When she warned me what people say
Live your life until love is found
'Cos loves gonna get you down.
Take a look at the girl next door
She's a player and a downright bore
She's a slowzer, she wants more
Oh,bad girls get you down."

It is a word that he made up and has bad connotation, most likely has something to do being sleazy (下流,肮脏的人)