At work I often have field techs calling me to run tests on phone lines for them. Their main test tool is nicknamed a “Buttinsky”, which is shortened in conversations to “Butt”. It can lead to interesting phrases. Here are the ones I have noted down:

“I’ve got my butt on the line now…”
“My butt is f#%ked. Can you check it?”
“…My butt’s not showing anything”
“I’ll just grab my spare butt…”
“I should be able to hear tone through my butt and I’m not”
“My butt is looping now”
“Here comes someone now - I’ll use his butt”
“I did a FAST test on my butt and it brought me through to you guys”

I like to think the guy was talking about Tone when he said “I should be able to hear Tone through my butt and I’m not.”