Shit mother dick is a phrase that is often used by 5th graders who think they know how to swear.
Example:

Teenager: Crap, I dropped my backpack

Kid: We're allowed to swear here?

Teenager: No you can't swear here you're like 8

Kid: Shut the fuck up I'm 11 you little shit mother dick
by HELL_NO February 14, 2016
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a combination of holy shit and mother fucker: an exclamation of excitement and/or approval
Shit Mother! The Steelers kicked some ass yesterday! You know it.
by Nacho Grande October 31, 2007
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