The woman then defecated on the floor and flung the feces at staff members behind the counter.
She cleans herself up with some napkins, throws those at the employee as well, and then proceeds to leave.
The incident took place at 6:15 p.m. on Monday at the Douglas Crescent Tim Hortons in Langley City.
Tim Hortons said the safety of staff and customers is a top priority and the corporation is working with the franchise owner to continue to look into the incident.
The encounter was caught on video by a camera inside the store.
The disturbing video was leaked onto the internet Tuesday, and begins with what appears to be a heated argument between a woman and a worker at a cash register.
Although the video contains no sound, a woman can be seen screaming at an employee behind the counter before grabbing a handful of napkins from a dispenser on counter, pulling down her trousers and relieving herself on the floor.
Police officer Holly Largy told The Province in Canada that the woman had been arrested and released from jail.
It's unclear what triggered the incident, but a spokesperson for Tim Hortons said it appears an employee had refused to let the woman into the restaurant's locked restroom. Largy said the police had dealt with the woman before.
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