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1.
The act in which a boyfriend or husband is under the impression that their significant other is pregnant with their child when in fact they are pregnant with some other man's child.
That bi@!#ch totally "shummed" him.
by Snoopdoggydex February 22, 2008
 
2.
The act of sharting and cumming at the same time while intercourse activities.
I shummed so hard last night my wife got shit faced and pregnant at the same time.
by ThrillJ August 22, 2014