An adjective used to describe something that is simultaneously fantastic and evil or terrible, such as drinking a beer someone was saving for themselves, driving someone else's nice car without permission, or sleeping with someone who's cheating on their boyfriend/girlfriend. In other words, a good thing made better by it being forbidden, but which also causes a bit of guilt.
I promised myself I'd stick to my diet, but I ended up eating some of that cheesecake anyway, and it was sinfulicious.
Man, that married chick is so hot, it's sinfulicious to be watching her like this.
I stole these sunglasses from my brother. They're awesome, but he's pissed. Totally sinfulicious.
another term for a station wagon, mini-van, or any other kind of vehicle that is targeted at the "family" demographic(also M.A.V.)
"Tactical advantages aside, the M.A.V. is top of the line for the holy warrior troop transport manufactured by the Church of Latter Day Saints Military Industrial Complex. Also great for family trips...to heathen lands."
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.