Referring to the phenomenon that occurs at weddings when all women present become more attractive, receive a boost in their numerical rating, and increase their potential of getting laid. This is usually due to a number of factors not the least of which are alcohol or the fact that one is generally confined to a somewhat small space over a lengthy period of time thus reducing the number of possible mates.
noah- "That chick from the wedding was hot."
josh (looking at the picture of her)- "She's not that hot dude."
adam (overhearing the coversation) - "That my friends is what I mean by 'wedding hot.' She was a 7 and that night she was a 9."