Nooskaline
The precise line where you pass from (innocent) innuendo to awkward silences. When crossed nothing can sound innocent, and every response is met with arched eyebrows.
A: Yeah I'm not really excited about X
B: somebody isn't doing enough then.
A: Oh my! I think we just crossed the Nooskaline
B: somebody isn't doing enough then.
A: Oh my! I think we just crossed the Nooskaline