A vandal spray-painted a vulgarity on the window of an NYPD van in Queens over the weekend as its officers were attending a community event, police said.

The van was parked in the Astoria Houses public housing complex when the vandalism occurred Saturday, cops said.

After the event, the officers discovered “SMD,” which stands for a revolting term, in white lettering on the van’s driver’s side windows.

Police are investigating the incident.