BPA, or Big PenisAura, is defined as the general air of imperturbable awesome that a man of significant endowment exudes at all times. A good example of BPA is seen in the behavior of motorcycle cops, who regardless of the possibility of being shot in the face and/or groinal region, still approach a pulled over vehicle with all the attitude and condescension one would expect from a nuclear-armed POTUS addressing a heckling girl scout troop.
"When D strutted into the room hips first with that look of total determination on his face, my testes shriveled in fear. His BPA intimidated the shit out of me."
"Barack Obama won the election because of his BPA. No man of ordinary genital disposition could project such charisma and self-assurance."