To be completely speechless.

when you're having a snack, and its too good

also said in a British accent

The free pair of fuzzy sock like Snocks that comes with a Snuggie.

Socks and sneakers

The unusual practice of biting and/or swallowing the bubbles
emitted whilst flatulating underwater. This can be achieved
by the individual or by another party.

The behaviour a long list of articles displays when prices are still being calculated during scrolling.

To hit forcefully in the head.