Etymology: Canadian, particular to rural areas, especially Lanark County Ontario and most of Alberta; An amalgam of the words give and her; made popular by movie "FUBAR"
1. Going all out and/or balls to the wall to take care of business as quickly and as awesomely as possible
2. Acting in a way that is like you're rocking out really hard, but at the same time, trying to solve a problem that may or may not involve drop-kicking something without hesitation
This definition (not the noun 'giver' which means 'one who gives') is a North American word meaning to 'go hard' at something. Usually refers to (but not limited to) drinking, fast driving, partying, working, and possibly sex. Mostly used by Canadians; probably a short form of 'give 'er shit' meaning give it some gas, or put some muscle behind it!
The word is currently enjoying a surge in popularity since the release of the movie FUBAR and is now used frequently in an ironic or lowbrow way.
Past tense usage combines the present participle and the past tense of "to be".
"Dave and I were given'er last night right up to the time of the puck drop before we realized the game was on pay per view. "