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1.
The act of checking the crotch of your pants for durability before you put them on to avoid an embarassing blow out.
Me: Did you see her crotch?

You: No! What happened?

Me: She must not have done a crotch check this morning because she just had a blow out!

You: That's like the 4th pair she has blown!
by **MAT*** March 14, 2011
 
2.
This is the action people commonly take when they are wearing underwear over their pants and need to make sure that the jeans underneath aren't making it look like they have a penis. This also takes place just in case you thought you lost your vagina or penis. If your vagina or penis is detachable then you understand.
Do these pants make me look like I have a penis? Crotch Check!
by ** April 06, 2005