The time at which any individual of any age or gender (especially those under the legal drinking age) gets shitty-wasted and Hammered.
Shmammer time can be throughout any time of the day, especially in the extremely early hours of the morning (for minors= "late" hours of the night) and with anyone who is willing and capable of getting shmammered as well.
Warning: not suggested to get shmammered alone or if unintentionally knocked up.
The act of getting too drunk and trying to tell people how drunk you by using the word either smashed or hammered. But seeing that your so drunk you can't talk, in the middle of your sentence you get real confused and the word "schmammered" slurringly comes out of your mouth.
Amanda put down her drink, looked me in the eyes, got real excited and said, "Schmaynard, I'm Schmammered."