If your sails are filled with the wind on the opposite side to what you want (for example, if they are trimmed for the starboard tack, but you get the wind from the port side), you are said to be backwinded. Found on http://www.encyclo.co.uk/local/20645
If your sails are filled with the wind on the opposite side to what you want (for example, if they are trimmed for the starboard tack, but you get the wind from the port side), you are said to be backwinded.