To receive a blow job. Comes from the fact that person giving the job is kneeling as if they're doing a blessing.
"I told her I wanna ride out, and she said yes / We didn't go to church, but I got blessed." - Pitbull/Ne-Yo – "Time of Our Lives"
OR
If you go into the confessional booth with that Catholic priest, there's a good chance you'll get blessed.
