Dear illBeYourButtSlut!
Since this is basically a sex forum, and the community here are quite open-minded people, it is absolutely ok to ask about gaping or any other sexual practices.
Hopefully, you're enjoying your time here!
Apparently, gaping is a technique for advanced anal sex practitioners. Personally I've never got so far in my anal play but know from those who have has such experience, if done right, sane and safe, gaping can be an incredibly pleasurable adventure.
BTW, you're welcome to explore
Guide on pegging which leads you through everything you want and need to know