See I first encountered this term amongst teenagers (decades ago) when describing their parents friends. And was basically their way of saying your mum is really attractive. It would always end with the commentator getting the micky taken out of them and was generally meant in a non threatening way.
What i do think is when grown up use it to describe the intention that they would possibly act out. Then it annoys me.
I think i must just have a liberal view as ds swearing doesnt bother me either. Its the situation in which he swears.
Different people, different rules different opinions.