Definitions

1. noun

a person who likes to be thought of as being better than others, often in an annoying way

“The self-proclaimed expert turned out to be a prigster, who tried to impress everyone with his knowledge but was actually quite ignorant.”

2. verb

to behave in a way that is considered annoyingly pretentious or superior

“He prigsstered his way through the conversation, constantly correcting others and boasting about his achievements.”