Why do Sikhs say “Band Band Kataye” all the time? What is the meaning of it?

Waheguru ji ka Khalsa Waheguru ji ki Fateh
Bhai Mani Singh was martyred by cut each body joint band band katiya gai see????.
He is childhood companion of Guru Gobind Singh, a great Sikh personality of the eighteenth century, occupies a very esteemed position in Sikh history, when he assumed the control and steered the course of the Sikhs’ destiny at a very critical stage.
A great scholar, a devoted Sikh, and a courageous leader, Bhai Mani Singh willingly laid down his life to uphold the dignity of the Sikh religion and the Sikh nation. The nature of his martyrdom has become a part of the daily Sikh Ardas (prayer)
ਮੇਰੀ ਸਿੱਖੀ ਸਾਬਤ ਰਹੈ I ਬੰਦ ਬੰਦ ਕਾਟਤ ਨਹਿਂ ਦੁਖ ਅਹੈ I੧੪ I
ਸਿੱਖੀ ਮੈਂ ਕਿਛ ਭੰਗ ਨ ਪਵੈ I ਦੇਹ ਸੀਸ ਤੁਰਕਨ ਸਿਰ ਭਵੈ I
ਦੇਹ ਕਟਨ ਮੈਂ ਦੂਖ ਨ ਮਾਨੋਂ I ਸਿਖੀ ਰਹੈ ਮੈਂ ਵਡ ਸੁਖ ਜਾਨੋ I ੧੫ I
Bhai Mani Singh has the distinction of belonging to a family of martyrs. Devotion to the Gurus was in his heritage and his family can rightly boast of an impressive record of sacrifices. His grandfather, Balu Ram, had died fighting for Guru Hargobind in 1634. Bhai Dayal Daas who was tortured and executed at Delhi before the martyrdom of Guru Tegh Bahadur in 1675 at Delhi was the elder brother of Bhai Mani Singh. As mentioned by Kesar Singh Chhibbar in ‘Shahid Bilas’, Hathi Chand, Lehna Singh and Sohan Singh who died fighting for Guru Gobind Singh at different places were younger brothers of Bhai Mani Singh. As mentioned by Dr Rattan Singh Jaggi on page 16 of his book in Punjabi ‘Bhai Mani Singh Jivenee and Rachna'(1983) Punjabi University, Patiala, his five sons-Bachitar Singh, Ude Singh, Anik Singh, Ajaib Singh and Ajub Singh gave their lives fighting against the Mughals in 1705. Lakhi Rai who cremated the headless body of Guru Tegh Bahadur at great risk was father in law of Bhai Mani Singh. Bhai Gurbax Singh and Bhai Chitar Singh, sons of Bhai Mani Singh, were martyred along with him in 1734 in Lahore.