I Am Confused About Some Things That Are Going On In My Life

I'm confused... I just got a new job but my team mates conversation's are not understandable they use word's that not everyone knows or heard of before, also the topic of the convo's are very different (most of the time I don't know what they are on about) When they ask my opinion on something or get me involved in the convo I just nod along to what they say and pretend to understand but never really get the topic. I've asked a few times but even when they explain it I still don't know what's going on!!

Should I just keep what I'm doing? - Pretending to know..Please let me know your thoughts on this!