A Facebook.com post meant as a joke got two Aiea High School students suspended Tuesday.

Cory DeGuzman won’t be able to attend the last few days of school or take his final exams after he posted a photo of his rear end with his friends’ signatures on it. (He’d had his friends discreetly sign his posterior while in math class, got a friend to snap a photo of it with a cell phone, then put it up on his Facebook page.)

The school got word of the post, and, after an investigation, DeGuzman and the classmate who took the shot were suspended through Thursday, the last day of school.

“Aiea High School does not condone the use of technology for inappropriate and unethical purposes,” said Aiea High Principal Michael Tokioka, in an emailed statement. “We want to assure parents … Aiea High School takes these types of behaviors very seriously.”

DeGuzman called the suspension “dumb,” though he also admits having his friends sign his rear while he was supposed to be taking math notes wasn’t that smart, either.

“It was just for memories and stuff, just between me and my friends on Facebook,” said DeGuzman. “It wasn’t like I was doing anything bad.”

DeGuzman’s father, Jerry, said the photo shouldn’t have been taken, much less posted, but also said he didn’t see the need for a suspension and questions how the school can punish his son for something published on a social networking website.

“Kids will be kids,” he said. “The bottom line is, How did this harm anyone?”

This is DeGuzman’s first suspension.

The offending shot, for a time DeGuzman’s profile photo, has been taken down.