A 'guerrilla' campaign selling Northern Territory tourism merchandise emblazoned with a lewd slogan have come under fire by government officials who plan to take legal action.

The website, called 'NT Official,' sells t-shirts, singlets and stickers decorated with the slogan: 'See You in the NT - The top end, different from the bottom end.'

A spokesperson from Tourism NT said many of the souvenirs featured the trademarked 'Brolga' logo and the 'underground' group had failed to provide the proper commercial attribution.

The spokesperson said they will send a letter to the group before launching legal action and claims to have not been able to get in contact with the group's organiser.

An NT Official member told Daily Mail Australia they have 'not been contacted by any tourism officials at this stage'.

A 'guerrilla' campaign selling Northern Territory tourism merchandise emblazoned with a lewd slogan (pictured) have come under fire by government officials who plan to take legal action

The group has more than 6,000 likes on its Facebook page and links to its website where it sells shirts and singlets for $29.99.

In a media statement on Monday, NT Official said its aim was to 'bring attention to the unique Northern Territory as an ideal destination for the young or young at hearts.

Despite the attention from government tourism officials, they will continue to deliver orders and has new designs on the way, according to the statement.

Tourism NT said the group was not affiliated with the government body and are looking into whether its logos infringe on their trademark, NT News reported.

The group has more than 6,000 likes on its Facebook page and links to its website where it sells shirts and singlets for $29.99

'NT Official' also post picturesque photos of the Northern Territory to its tourism social media pages

'Tourism NT is aware of inappropriate use of our trademarked Brolga logo,' Tourism NT posted on its Facebook page on Monday

A spokesperson from Tourism NT said many of the souvenirs featured the trademarked 'Brolga' logo (pictured) and the 'underground' group had failed to provide the proper commercial attribution

The spokesperson said the issue is more with the pictures rather than the lewd slogan.

'Tourism NT is aware of inappropriate use of our trademarked Brolga logo,' Tourism NT posted on its Facebook page on Monday.

'We don't condone these actions and are in no way affiliated with such promotions'.

Despite the attention from government tourism officials, they will continue to deliver orders and has new designs on the way, according to a statement