A phrase used to indicate that a romantic or sexual relationship has ended, or is, as when the
wheels do fall off a wagon,
kaput. Sometimes heard as "wheels fall off
the wagon" or "wheels falling off the wagon"
"She found out he was also shagging her brother and so the
wheels fell off the wagon then."
"Her incessant
screwing around on him made the wheels fall of
the wagon, and he dumped her."
"If he keeps that up, I can see the wheels falling of the wagon soon."