"Bitch" was an insult.
Ace yelled "Back off, bitch!" to the Timewyrm, who was attacking the Seventh Doctor. (PROSE: Timewyrm: Genesys) She later called the Grand Matriarch a "callous bitch" when she killed Fetch. (PROSE: Timewyrm: Apocalypse)
Rose Tyler once called Cassandra O'Brien.Δ17 a "bitchy trampoline". (TV: The End of the World)
Rhys Williams ragefully called his girlfriend Gwen Cooper a "selfish bitch" when she confessed her affair to Owen Harper. (TV: Combat)
Kathy Swanson once informed Torchwood Three that, "My team bitch about you all the time." (TV: They Keep Killing Suzie)
In 2009, Jack Harkness called Brenda Williams, whom he believed to be a Nostrovite impersonating her, an "ugly bitch". Rhys Williams punched him for uttering these words, after it was revealed that it really was Brenda. Rhys later referred to that Nostrovite as "some alien psycho bitch". (TV: Something Borrowed)
Missy used the term, telling the Daleks to inform the Supreme Dalek that "the bitch is back". (TV: The Witch's Familiar) She told Jorj, "don't be a bitch", when he asked her if she was human. (TV: World Enough and Time)
Sancroff, while sentenced to permanent banishment on a security planet, called Ruthley a "mad old bitch" when she revealed she had allowed bio-engineered assassins to land on the planet with the intention to kill him. (AUDIO: The Sirens of Time)