The WMPO Portsmouth Ohio "Buddy" bumper package was a joke created by some (I believe) students at Ohio University Athens who did it for a class project. It was FAR more perjorative (and indeed obscene, and FUNNY) than described above. At some point, the owners of WMPO became aware of it (the audio bits were quite widely available thru the broadcast grapevine in Ohio; I acquired a copy of the tape) and were unamused enuff that legal action was threatened.
Allegedly there was a station in West Virginia in the 80's (?) with the call letters WJIZ. And (allegedly) they ran bumpers that said: Don't touch that dial, there's JIZ on it!
This was reported to me in the 90's by a fellow who worked there.
WHIZ Zanesville Ohio had no image bumpers that I recall but DID put out bumper stickers with the call letters. They often appeared above urinals in public places.
WHOK Lancaster Ohio was commonly referred to as "The Hacking Voice of the HOCKing Valley,"
When Screen Gems acquired Wheeling Broadcasting in the 70's they flipped the format on WWVA's FM to rock and changed the call to WCPI (Columbia Pictures Industries). The rock competition in the the market was WOMP in Bellaire. WCPI ran bumpers saying things like "Are you WOMPED OUT?"