Mee-maw

Well, sometimes mee-maws have things to do, like moms and little girls.

Source: wiktionary

So we walked round and mee-mawed at one another. (Mee-mawing is mouthing words at each other without making a sound using exaggerated lip movements. This is the name the weavers, who use this technique all the time, give to it.)

Source: wiktionary

On working days weavers who had jobs were already mee-mawing across the racket of looms as the van delivered and in hot weather, with weaving shed doors open, the sound bombarded the streets.

Source: wiktionary

If you're familiar with Les Dawson's infamous creation Ada Shufflebotham, one of the Northern housewives in the 'Cissie and Ada sketches, you'll have an idea who Gran was. Just like Ada, she pursed her lips and silently mouthed the unmentionable things in life, rather than saying them out loud. This was known as 'mee-mawing' and it originiated among the mill workers of Lancashier, because they couldn't be heard above the deafening noise of the looms, even when they shouted. After a while, mee-mawing became a part of daily life, especially when it came to discussing embarrassing or saucy topics. Basically, you mee-mawed anything you didn't want people to overhear, even when there was no one around to listen in.

Source: wiktionary