You know, where you snap it and hurt yourself each time you catch yourself saying "the truth".
Alternatively, you could say the two words out loud rapidly over and over until the words just disappear into an hysterical meaninglessness and, thus lose their constructed meaning.
Try using a Donald Duck voice when you say it, or perhaps a Yogi bear voice. Joan Rivers saying these two words over and over, hands on hips, in her hyper-bitch tone would be too much.
It's an exposure strategy that's used in some psychotherapies to divest hated words of their baggage. Before you know it, every time you hear the phrase "the truth", your lips will curl upwards in a nice sly smile!