A term relating to the accumulation of bullshit in a relationship, causing an individual to reconsider his or her current situation, ultimetly leading to a break up. Includes all sorts of bullshit: lying, cheating, lack of sex, ignorance, etc.
David: Hey Jimmy, why did you break up with Rachel?
Jimmy: It was bullshit buildup! I couldn't take it anymore...
David: Sucks man, better luck with the next girl.