Wanted for moped thefts and other crimes, Nathan Bick began responding to Wandsworth Police in a strange series of exchanges on Facebook.
After cops posted the appeal on social media a woman responded to say she would be in touch if she spotted the wanted man.
But to everyone”s surprise the next comment appears to have been left by the suspect himself.
Determined to have the last laugh, Bick continued: “Think u didint [sic] understand when I said keep up but yeah am back on my Back Wheel for you pigs 24s.”
In the initial appeal, shared almost 400 times, Wandsworth Police said Bick is an 18-year-old “prolific motor vehicle thief”.
He likes to steal mopeds and often uses them to commit other crimes, cops said.
They added: “He should not be approached by members of the public and any sightings of him should be reported to us via 999.
“If you have any information in regards to BICK, then please call us on 101.”
Earlier this year a runaway child killer taunted police by posting beach snaps as he relaxed on holiday.