The young woman was filmed launching a tirade of abuse at the employee at the South London branch, with the clip since going viral.
In the footage, the teen can be heard introducing herself before asking: “So have you been sleeping with my dad? Did you have sex with my dad?”
The unnamed worker, appearing stunned by the question, then shakes her head, replying: “What do you mean? No!”
But the teen, who is seen wearing a bright orange slogan t-shirt and leather jacket, doesn’t stop, asking: “Are you sure? Don’t lie to me, because why did I find this in his bag?”
She is then seen showing the other woman a photo on her mobile phone in the two minute clip posted to social media.
As stunned shoppers gather around, the shocked Boots worker, clearly embarrassed, then replies: “You might try… you’re going to come to my work place… to disturb me?”
But again the teen doesn’t let up, replying: “I don’t care, I don’t care! You know what I’m talking about.
“This is your address isn’t it? Is this your address? And it was in my dad’s bag… and is this not your house?”
So have you been sleeping with my dad? Did you have sex with my dad?
Angry teen
The uncomfortable employee then walks away from the counter to pick up a phone to call the police.
She is then followed by the teen, who continues to rampage, saying: “I’m talking to you! Is this not your house and you’ve been sleeping with other people’s mans?
“You want to call the feds now?
“When you’ve been sleeping with my dad and my mum f***ing respected you calling you aunty?
“Yeah you call the f***ing police I’m not scared of no police. You can’t even close your f***ing legs.
“Yeah you call the police because you know I’m telling the truth.”
It isn’t until a security guard at the store stepped in that the clip ends.
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Boots has since confirmed they were supporting an employee at one of their branches.
A spokesperson for Boots UK told The Sun: “We take the safety of our team very seriously and can confirm the police were called following an incident in one of our stores.
“We are currently supporting our colleague who was very shaken by the event and the subsequent sharing of the video on social media.”