A while back I came across a massive PDF that resulted from a public records request of denied vanity plate applications, covering all 50 state DMVs. A lot of the banned plates were incredibly innocuous, or maybe I am just not getting the dirty jokes involved. Rejected plates included:
AFOOT
ACES
ABNORML
ALCHEMY
ALRIGHT
ALICE
ARCHIE
AOKAYE
AUTISM
AVIATOR
HEYJUDE
HIJINX
INSPIRE
JELLO
JTKIRK
KAYAKER
L8AGAIN
PRAXIS
QTRBACK
QUAKER
SHOPGRL
SHOEGRL
TOUCAN
UNMOVED
VRMONTR
Sorry no source for this, but here’s a similar PDF list for just Nebraska. Lots of offensive stuff, but also lots of WTF denials.