That one friend you have who is fundamentally a bitch. This is the lowest form of friend and should be rediculed mercilessly when acting like a bitch towards another friend.
When you are fingering a girl, but unsure of how many fingers to use, you decide that 4 fingers is the best option. The orientation of your 4 fingers should be vertical, in the same plane as the vagina.
someone (usually a female) who is so rude, mean, or generallydisliked that just plain Bitch doesn't cover it, but since they are one person, cannot be defined in the plural; Bitches