An Alpha Female is your typical Type A, loud-mouthed, confident, controlling, assertive, power-wielding Alpha Male, with a vagina instead of a dick. As with Alpha Males, it is often frightening if there's more than one of these in the same room.
Note: An Alpha Female is no more an "Alpha Bitch" than an Alpha Male is an "Alpha Cocksucker."
Me: "Sometimes I feel like I may be a bit emasculating, but my boyfriend doesn't seem to mind; he only likes Alpha Females. They hold their own."
My friend: "Yeah, that's true."