Wiktionary
loaded for bear
a. 1 (context idiomatic English) thorough equipped, as for a demanding task or confrontation. 2 (context idiomatic English) mental prepared for a daunting situation or confrontation.
Usage examples of "loaded for bear".
When it was hunting season, he came loaded for bear in a black Ford Bronco.
They were loaded for bear, Gearing saw, lots of personal weapons evident here and others loaded into the cargo area below.
It was my notion those Fetchens would borrow guns and come back, loaded for bear and Sacketts.
They were moving south, sir, hard to tell how many, but they're loaded for bear.