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1.
When a guy ejaculates onto a women's face and it goes above her lip, taking the form of a white moustache. Clean Sanchez.
Guy: hey you got something on your face.
Girl: what, do I got milk?
Guy: you got jizz.
Girl: damnit, why'd you give me a jizzstache!
by Hugh jurection December 10, 2011
 
2.
When you finish giving someone a blow job, then when they cum, it lands on your face making the jizz look like a mustache.
Your mom after she gives your dad head, and she says she was drinking milk, or brushing her teeth. It really is a jizzstache.
by Minihandss May 02, 2010