There are four types of bull:
Bull = dumb / rubbish
Bullcrap = a terrible situation
Bullshit = an absolute lie or threat
Bullfuckingshit* = more than an absolute lie; describes high school romantic rumors and lies
*Politer way to use if under 18: bullfreakingcrap OR bullfreakingshit
One girl told me my crush was single and wants to go out with me and my crush said she already has a boyfriend. That one girl is telling me bullfuckingshit!