What it has come to mean in common speech is to do something without previous thought or preparation.
There are many shooting positions . . . standing, prone, sitting, etc.
In rifle shooting, offhand means to basically to be shooting in an unsupported position.
Strong side to the target, not face on, legs apart.
Dominant hand, holding the pistol, extended fully and straight towards the target.
Weak hand either in the pocket, small of back, of resting on the weak side hip.
Head fully turned towards the target for sight acquisition looking down the shoulder.
Now you know.
And, by the way, I do love his butt!
1 1/2 Oz. Fresh Meyer Lemon Juice
1 1/2 Oz. Tequila
1 Oz. Triple Sec
Sea Salt For Rimming Glass
Rub the rim of a margarita glass with a lemon slice. Swirl the rim through a small pile of kosher or sea salt to salt the rim.
Put the meyer lemon juice, tequila, and triple sec in a cocktail shaker, add ice and shake for 15 seconds.
Put crushed ice in your glass. Strain the cocktail into the glass and enjoy.