A pair of female breasts. Usually referring to and ugly, 'floppy' or sad looking pair of breasts. Not a flattering term; do not attempt to use as a compliment, such as : "You have an amazing pair of flops."
The sensation experienced after a very large nicotine headrush. Usually results in slight loss of muscle control, particulary in the neck, and giddy laughter. This intense has the potential to make your head feel grossly overweight, resulting in your head 'flopping' into your chest.