A maintenance order according to Court Service Ireland:
Maintenance is financial support (money) paid by a person for the
benefit of a dependent spouse/civil partner and/or dependent children.
Spouses/civil partners are required to maintain each other according
to their means and needs. Parents, whether married or not, are
responsible for the maintenance of their dependant children.
If the parties cannot reach an agreement about maintenance an
application can be made to the court for a maintenance order.
When a delinquent spouse gets tired of supporting the children, the ex gets an order from the judge, but then the delinquent goes into hiding, because, according to the Court Service Ireland, a summons must be served:
The District Court office keeps a record of all maintenance payments
received. If payments fall into arrears the maintenance creditor can
prepare a summons to be issued (dated and signed) by the DistrictCourt
clerk for the recovery of the arrears. The summons must be served by
the maintenance creditor.
Because money is involved, the delinquent spouse becomes highly motivated to hide from the aggrieved spouse, and the aggrieved spouse becomes highly motivated to find the delinquent spouse:
Finally, I found you, Grumpy!
That comment has the distinct flavour of an irate ex waving a
maintenance order! :-)
The frustration of an extended search might intensify the ire of the aggrieved spouse, but the little smiley face at the end seems to imply that Grumpy finds humor in the interaction rather than anger.
The missing comma may be a typo in the OP, or it may reflect the playfulness of the actual dialogue. Either way, it serves to add to the humor:
Finally, I found you Grumpy!
Of course I'm Grumpy; now I have to pay the child support!