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1.
one of many types of dick cheese
Since he has not taken a shower his dick stinks from the schmagma build up
von Johner 6. Oktober 2005
 
2.
The cheese that gathers on your forskin.
Shit man I woke up this morning and had so much schmagma I could have made grill cheese.
von Switch16 7. Januar 2007
 
3.
lint on the foreskin of a man's lucious penis

also known as a case of "dirty dick"
My marine, Joe, gone in the war for so long, no shower, no moist toilette, no whitie tities, was suffering from schmagma.
von Jessica/Andres 23. November 2003
 
4.
a pungent, pasty, and gooey substance that forms in the foreskin of a penis.
After three days of extraneous activity and no shower my dick formed a very unpleasant type of schmagma.
von bac bac bac 30. Januar 2010
 
5.
Unpleasant sweat that developes on a man's taint*.

*Refer to "taint" in UrbanDictionary for definition
Hey Lisa Guerrero, Quit talking about John Wade's "schmagma" on Monday Night Football!
von Rob S. 8. September 2003
 
6.
an unsavory byproduct, usually produced by or on a part of the human body
I was preparing to go down, but was deterred by the schmagma I found.
von Jaytex 11. März 2003
 
7.
A term for a guy's jizz. Magma (volcanic flow from eruption) from the schmag (cock). Get it?
Dick laughed as Sally's face was blasted with his schmagma.
von Jeff 11. Januar 2004