Does the speaker say "slice" because the video is about pizza? Or is it a common phrase?

Native speaker’s answer
Rebecca
It does serve as a kind of pun here, yes! Since one can have a "slice" of pizza and he uses the phrase "a slice of" something, which is also a common phrase. "A slice of" something means a small amount, part, or share of something. Even if it's just a "taster" - a brief experience of something. Ex: You can have a slice of the prize money if you promote our team. Ex: You'll have a slice of luxury if you buy this chair. => small experience of