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Etymology
Literally “that which is inside a teddy bear’s belly;” compare the first (literal) example below.

Noun

 * 1) the inner workings of something, the nitty-gritty (but unlike "nitty-gritty", this expression does not necessarily imply "rolling one's sleeves up" or "getting one's hands dirty" but rather acquiring conceptual/theoretical knowledge about the inner workings of something)
 * 2) seeing the inner workings of something
 * 3) trying to fix something by trial and error with catastrophic results
 * 1) seeing the inner workings of something
 * 2) trying to fix something by trial and error with catastrophic results
 * 1) trying to fix something by trial and error with catastrophic results
 * 1) trying to fix something by trial and error with catastrophic results