|First appearance||Ho Yeah!|
|Voiced by||Renée Zellweger|
She has somewhat of a low IQ, but seems to know that education is the best. She was kicked out of her apartment and stayed at the Hill residence for rent. She seems impressed of Peggy Hill and Luanne Platter's education successes, and even hopes to get a GED, similar to Lucky. Peggy says that she looks familiar to Debbie Grund. Hank Hill seems to have difficulty allowing her into his house, but gradually starts to accept her until he discovers that she is actually a prostitute who escaped the pimp Alabaster, who misunderstandly thinks that Hank is acting as Tammy's pimp. Later, Hank pays Alabaster and tells him that Tammy is his "ho", and helps Tammy get Alabaster off her hands. Tammy is later seen in the episode, "Lucky's Wedding Suit", attending Lucky and Luanne's wedding. She is voiced by actress and native Texan Renée Zellweger.
- Her hair and hairstyle are very similar to that of Peggy Bundy from FOX's sitcom Married... with Children.