1. Wannabe teachers who fill in when regular teachers are unavailable. During strikes, are called SCABs. Usually lost without lesson plans, and serve more as adult supervision than in teaching capacities. If they attempt to teach, they frequently contradict what the regular teacher has taught. Also known as subs.

2. Prostitutes hired for the purpose of teaching uninitiated kids about the birds and the bees by friends orredneck rents who can't figure out any better way to get the lesson across, or perhaps because they want to watch and learn a thing or three themselves.
That sub we had today was a real substitute teacher.
by FridgeRaider May 23, 2004
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the best kind of teacher to annoy the hell out of
You should've been there! We threw papers, pencils..all over the place. We asked stupid questions like "Why is the sky blue" and crawled all over the floor. The substitute teacher couldn't do shit about it! ~ (Dirge)
by Dirge February 14, 2005
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Something that McDonald's puts on their hamburgers instead of real cheese. Is made out of palm oil and does not really has a flavor but melts very well and is very, very cheap.
Customer; "I would like a nice juicy McHamburger with Cheddar cheese"
Nutritionist; "Actually, that's not cheese. It's substitute cheese. It just looks like cheese"
by Ronald Mac Donald September 2, 2008
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A school bus driver different from your usual one. Commonly not very good at their job, or with no idea how to use the GPS.
"this substitute driver is completely inept"
by Beholderface September 26, 2017
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A realistic dildo, veins and all are included
You shouldnt be able to tell the difference between a meat substitute and the real thing.
Jim "Jenni where is your meat substitute ?"
Jenni "it's in the drawer"
by Bubza101 December 11, 2017
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1) A hetero-fexible male
2) A heterosexual man who drinks and becomes increasingly more gay
3) A heterosexual male who will act as a gay man (i.e. cuddle, receive sexual favors) when a fellow homosexual is not present.
"Are there going to be any homos or homo substitutes at that party, if not then I see no reason to go"

"I cuddled with a homo substitute last night. Almost as good as the real thing
by Pr3dair October 19, 2010
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The act of switching pillow faces when a pillow becomes too warm due to absorption of the sleeper's body heat. This act can be accomplished by turning the pillow over, revealing the unused and cool side, or by getting a new pillow.
Last night I was pretty hot after doing my girlfriend. So my pillow got really hot and I couldn't fall asleep. That's when I pulled a pillow substitution. It was some tag-team, fresh action.
by juanch June 16, 2010
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