Before he performed Saturday night, comedian John Bush said he was not sure how explicit his material would fare at his BU Central performance.

“People will be surprised at how blue I can go,” he said.

Cracking the “blue” jokes for about 30 Boston University students, Bush kept his promise, offering commentary on current events, films, his family and his girlfriend. He gradually covered raunchier material as the night progressed, though he began his set with, “My name is John Bush — two places you piss in.”

Bush joked about his girlfriend — a bikini-wax salon employee — and the Monica Lewinsky scandal of the late 1990s. He was also frank with his audience, learning from one front-row attendee what biostatics are.

“So, wait — you’re trying to find out how good drugs affect people?” he said. “Geez.”

The comedian impersonated Ronald Reagan, Bill and Hillary Clinton, Johnny Carson and President Bush.

“[Bill Clinton] sounds like he never exhaled,” he said imitating the former president’s voice. “I was always waiting for him to just run out of air at a press conference and return with a different voice.”

Bush, whose credits include parts in The Thomas Crown Affair, “Spin City” and “Law ‘ Order,” talked about how his family moved from Hawaii to Minnesota during his junior-high years. The move helped him learn “to roll with the punches” as a person and provoked his inner comedian, he said.

College of Arts and Sciences freshman Audrey Harry, who left the event with a signed poster from the comedian, said she enjoyed his impressions, especially the “spot-on” imitation of President Bush.

As a self-proclaimed class clown, Bush has used his comedic skills to make new friends, he said before the event.

Bush, who is currently acting in Triple Espresso, a comedic play running in his hometown of Minneapolis, said he is at a point in his career where he wants to branch out more into film and television.

“I know what I’m doing now,” he said.

Bush advised aspiring comedians to create three-minute acts and try them out at open mics. The worst thing a new comedian can do is try out material for friends, he said.

“You don’t want to be up there concentrating on what your mom said about your joke earlier,” he said. “It ruins it.”