"
are movin, If your lips are movin
If your lips are movin, then you're lyin', lyin', lyin', baby
If your lips are movin, If your lips are movin
If your lips are movin, I said you're lyin', lyin', lyin', baby
[Verse
Meghan's trying to say that whenever the guy is talking, he's always lying. No matter whether there is some truth in it, there is always a lie involved. So whenever his lips are moving (every time he talks), he ends up lying to her. "I know you're lying, your lips are moving."