Bulldogs forward Brad Morrin has explained why he bit Parramatta's Timana Tahu, admitting it was a "brain snap" and apologising for it.

Morrin was placed on report after Tahu accused the 25-year-old of biting him on the arm just before half-time in Friday night's 34-22 loss to the Eels at Telstra Stadium.

Initial replays of the incident appeared to show Morrin latching onto Tahu's arm before the rugby union-bound centre lashed out at Morrin's head.

"I had my hands caught underneath and I more or less did it to get him off me," Morrin told a Fairfax newspaper.

"The main thing is that I got slammed into the ground.

"When I was in that position I had both my hands underneath and if I had my hands free I would have pushed him off me.

"More or less I gave him a nip to get him off, but I was more shocked than anything when I saw the mark it left.

"I didn't think I could do it that hard with my mouthguard in.

"I did go and apologise to him after it, it was a bit of a brain snap.

"I haven't done it before and I don't think I'll do it again."

The back-rower admitted to having a quick temper.

"I do have a bit of a short fuse - it was in the heat of the moment," he said.

"My head was slammed to the ground and I felt a bit defenceless down there. I was annoyed by that because I did hit my head pretty hard on the ground.

"It still doesn't condone what I did. He accepted the apology and said `it's fine, don't worry'.

"I apologise to everyone for what I did and hope to make it up to them and put it behind me."

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