Something that must be kept secret between two people. Usually the consequences of the secret being released would result in the death or the spoiled reputations of the two people.
- I made sure that Maggie would keep our baby a secretism until we knew what we were going to do.

- Somebody somehow hacked into our instant messenger conversation and revealed our secretisms to the public... POP (gunfire, suicide).
by warnurrrrr April 29, 2007
Acting in a mysterious fasion. Not giving full disclosure.
The secretism of that dude intrigued me. He wouldn't even tell me his name.
by Esabeth Regenbogen March 20, 2010

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