IAHHM meaning in General ?

It Ain't Half Hot, Mum is a BBC television sitcom about a Royal Artillery concert party based in Deolali in British India and the fictional village of Tin Min in Burma, during the last months of the Second World War. It was written by Jimmy Perry and David Croft, who had both served in similar roles in India during that war. It was first broadcast on BBC 1 in eight series between 1974 and 1981, totalling 56 episodes in all. Each episode ran for 30 minutes. The title comes from the first episode, in which young Gunner Parkin (Christopher Mitchell) writes home to his mother in England. The series has been accused of racism, homophobia and of pandering to imperialism.

In 1975, a recording of "Whispering Grass" performed by Don Estelle and Windsor Davies in character as Gunner "Lofty" Sugden and Sergeant Major Williams, reached number 1 on the UK Singles Chart and remained there for three weeks.