If I buy a board meant for someone 150lbs...
If I buy a board meant for someone 150lbs and I'm say, 180'ish is there a problem with that, will it snap out from under me?
haha heck to the no!...the rider weights really dont matter. Im 180 and have used a womens board (long story) for exended peiods of time, i think the "maximum" weight was like 140, but it did fine and i didnt worry at all about snapping
it's not going to snap like a twig if that's what you mean. but the flex will be very different if you're that far from the weight range. whether that's desirable or not is for you to decide.
Won't snap but will probably be a little a soft for you. Some more info would help, skill level, preferred terrain, etc.