Based on full service refueling at gas stations in oregon, where the driver is not allowed to pump his or her own gas.
In this context here the Oregonian is a full service Blow Job, where the woman does all the work from start to finish, from unzipping and de-belting, to cleaning up and re-pantsing.
Can also be called an Oregon Blowjob
Me: Dude, I totally got An Oregonian right before I left for work this morning!!!
Dude: NO WAY!!!
Me: Yeah she kept it off my slacks too!
Dude: That's some quality service there!
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