Children's TV presenter Dominic Wood is in hot water with the regulator after wearing a T-Shirt with "Morning Wood" on the front.
Ofcom has ruled that the slogan could cause offence because of its sexual connotations.
The TV watchdog accepted that the T-shirt could have been a harmless joke, but said it could also have had a "sexual meaning".
Wood stars in the Beeb's hit show "Dick And Dom In Da Bungalow".
The show has attracted criticism for belittling children who appear as guests.
The BBC said it planned to introduce closer checks on what the pair wear after Ofcom's rap on the knuckles.
