Marks & Spencer has been trending on social media over an advert for its vitamin D-enriched bread.

The advert stated ‘Putting the D in Bread’ - which the younger generations and urban-dictionary savvy customers found highly amusing, after associating ‘the D’ with a penis.

Twitter, as social media so often does, erupted into conversation about the advert.

MARKS AND SPENCER HAVE STARTED A NEW CAMPAIGN SAYING THEY ’PUT THE D IN BREAD’. THIS IS NOT A DRILL THIS IS NOT A DRILL.

— All Work & No Ethel (@Ethelmonster) August 18, 2015

If there’s one place the D doesn’t belong, it’s in bread #marketingfail pic.twitter.com/9XxAHbEYCd

— Sarah Kersley (@Sarah_Marie_K) August 18, 2015

I bread your pardon, M&S?! pic.twitter.com/KPjtjQKygJ

— Lee Dillon (@PTLeeDillon) August 18, 2015

While some users questioned whether the advert was a purposeful publicity stunt:

the M&S bread advert was most definitely a deliberate publicity stunt

— jordan (@Jordan_Mulvaney) August 19, 2015

M&S had very little to say on the matter: “We recently became the first retailer to add vitamin D to all of our bread to help customers get more vitamin D in their diet.”

A bit of a cock-up or genius publicity stunt - the advert has definitely grabbed some attention.