Peter (played by Chris Gascoyne) was seen telling his father Ken (William Roache) about his secret girlfriend Toyah Battersby (Georgia Taylor), when he got a phone call.
Tim Metcalfe (Phil Collison) told him Chloe had asked for his taxi services again.
The pair previously went on a date despite his on-off romance with Toyah but Chloe had paid him very generously before and Peter was only too happy to help.
Tim said to Peter on the phone: "I've got a customer here looking for her favourite man on a meter."
Peter Barlow appeared to make an x-rated comment
Chloe requested Peter's taxi services once again
Happy to oblige, Peter responded: ”Of course I can do it, have you seen the size of her tips?"
But viewers took to social media instantly as they wondered what word came out of Peter’s mouth.
Many fans on Twitter were left chuckling after appearing to mishear “tips” for “t**s”.
One wrote: “Did I just hear Peter Barlow say "have you seen the size of her t**s?” Did I or am I hearing things? #coronationstreet.”
“Peter Barlow….'Did you see the size of her tips..?' Snigger. #coronationstreet @itvcorrie,” said another.
The pair had previously enjoyed a date together
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The biggest blunders on Coronation Street
Thu, February 2, 2017
Coronation Street errors: Eagle-eyed viewers spotted 8 baffling blunders and mistakes on the popular soap.
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Coronation Street viewers were left amused by an hilarious gaffe which saw Faye Brookes present an empty bottle of wine at the Bistro
A third questioned: “What did Peter Barlow actually say #sizeofhert**s #coronationstreet”
“I love Peter Barlow. Dirty boy #coronationstreet,” one fan said.
Elsewhere on the ITV soap, Helen Flanagan made her return as Rosie Webster but trouble soon followed.
She will be grilled by the police alongside her sister Sophie Webster (Brooke Vincent) on tomorrow’s episode after they turn up with a search warrant suspecting there may be illegal drugs inside their luggage.
Coronation Street continues tonight at 8.30pm on ITV.