Hi c_b. I say "wee-jeed", but I've never heard anyone else say the word. "Ouija" itself can be pronounced "wee-jah" or "wee-jee", so I suppose "wee-jahd" and "wee-jeed" are both okay.
The one time I used it in conversation, it was to say "She ouijaed it out of him", meaning "manipulated into revealing". I like that definition better, but I wasn't aiming for a madeupical word, but to qualify "ouijaed" for my list of panvocalics, so I gave a definition that matched the main uses I've seen online. I'll make up for that now (see ouija).