Which idiom do you use?

I use "on the tip of my tongue".

Lots of 'em

Idiom mots

'Slicker than snot on a doorknob.' Sometimes emphasized with a 'brass doorknob.'

'Gotta go talk to a man about a horse'--meaning where's the restroom?

'Useless as tits on a boar'

'Thinks below the navel' usually describing a male.

Idiom words--

Gom--perusing with no intent to buy.

Mophus-Someone lacking the intelligence to 'pour piss out of a boot'.


Just a few

Rap

A word I am trying to think of can be "at the tip of my tongue" or "on the tip of my tongue"