Thick shake is a word used by Engelish kids cause they think its cool.
chris: I will have Big Mack.

Lorence: Ill have a thick shake.

Mc.donalds staff: you meane a
milkshake.

Lorence: yea a thick shake.

Mc.donalds: Ok then.

Lorence: Silly man dident know wat a

thick shake is.

chris: lorence your such a fag lol.
by rodam July 11, 2006
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The act of unloading thick (often chunky) feces into another's mouth for sexual pleasure. If The feces is runny, it's often referred to as "Soft Serve."
My girl took in my thick chocolate shake the other night, and she didn't even gag.
by Gaffcow November 27, 2015
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