Green’s Dictionary of Slang

bullshit v.

also bullsh
[bullshit n.]

1. [1920s+] to gossip, to chatter inconsequentially; thus bullshitting n.

2. [1940s+] (also bullshit on) to tell lies, to tease, to confuse with false information; thus bullshitting n.

3. [1960s+] (also bullshit around) to play around, to waste time; thus bullshitting n.

In phrases