1. To utilize nonsense as the sole method of getting ahead of other people unfairly, and succeeds at it. Normally associated with unfairly degrading the position of a much more diligent individual.
2. To repeatedly apply the concept of bullshit to get through his or her daily life, and would dismally fail without.
3. A less offensive version of the word "bullshit".
4. A lie, fib, bullshit, etc.
Gonna have it done in 2 months? Don't bulltesh me. You already said that 6 months ago.