craigb
Hard to tell from that pic, but it looks like the 'ol F/D that AC/DC loves (an open D chord with your thumb on the low F). 
Or, you've had too much beer and you're just holding onto the guitar with your eyes closed hoping you won't drop it or fall over until the room stops spinning (been there!). 
Considering I know which band this is from, I know that it's not the F/D chord
It's either an A (power chord), with a muted E string, or somewhere in a solo
I'm very careful with alcohol be(er)fore gigs.
Have a couple of not so successful attempts at playing after a few too many