gala-liar
a person who lies so much they should have a job doing it full time
You said you had a date. Then you said it was a dinner. Then you said it was a movie. Then you said it was a dream.
You told me you got an A on your test. Then you said you got a B. Then you said the teacher made a mistake.
You said you were going to clean your room. Then you said you were going to start cleaning it. Then you said you were going to think about cleaning it.