My God trick, my dick is hard, thick as a yardstick
“Trick” is a word used to describe a girl who teases you and messes with your head due to her constant flirtations.
A yardstick is a straightedge object used to physically measure lengths of up to a yard (0.9144 metres or three feet) high.
They are often thin and made of either metal or wood, so once again this is Eminem poking fun at his dick size, in terms of width though since (generally) most men do not brag about how thin their penis is, and he’s using the texture of a yardstick to explain how aroused he is, (i.e. metal, wood).
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