I call BS on that one.

"Got one in there called BS, too?"

I'm going to have to call BS here.

LEO: I'm going to call BS on it, but we'll see.

His fourth album was called Pure BS.

I'm calling BS on this.

This is what we call BS.

Visconti was quick to call BS on the story.

I can call BS pretty quickly, and I tend to "warm up" interview subjects.