Three Sheets to the Wind? Please explain your thoughts on this one?

Question

Where do you suppose this came from?

Answer 1

I'd like to answer this but I'm seeing double letters on my screen. glug glug glug

Answer 2

I always presumed it was an old sailor's term.  The sheets are not the sails, but the lines (ropes) that you use to trim the sails.  When a sheet is to the wind I think that it means its slack so then the sail is untrimmed and flapping in the wind.  If you have three sheets to the wind, then your sail is slack, luffing and ineffective - like a really drunken sailor.