Impulsive behavior like spending exsessively is one of the DSM criteria for BPD.
I do not do this personally, in fact I have an obsessive need to plan my finances down to the dollar.
However I have gone overbord in other ways. Substance abuse, verbally attacking someone in defence of a friend, ETC.
I try now that I am sober to really think about the consequences of my actions, but unfortionatly I still mess up once and a while.