Related to "lasers" and "shoop da whoops", a "Royal Rainbow" is what happens when a taco is forced into the mouth of the person charging their laser. The caster instead releases a Royal rainbow, and possibly the swallowing of one's laser, and can end in the shooper asploding.
*Jered fails HARD*
Phil: I'MA FIRIN' MAH LAZOR!
*Jered shoves taco in Phil's mouth*
*Phil releases Royal Rainbow*
Phil: OPS I SWALLOWED MAH LAZOR!