Bossan (ぼっさん, born August 1972) is a 2channel user with a handle "りぼんちゃん ◆BIJOU400pc", who was famous in the 2000s. He was known for his role-playing as the Hamtaro character Bijou (known as リボンちゃん Ribon-chan ("Ribbon-chan") in the original Japanese version).
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One day, in a drunken moment, he posted a selfie of himself, revealing that he was a grown man. Since then, it became popular among the netizens to make shitty photoshop images with him.

His nickname comes from りぼんのおっさん Ribon no ossan ("Bijou the old guy"), which then collapsed to りぼっさん Ribossan, and was further shortened to ぼっさん Bossan.

A bizarre copy & paste counterfeited as a post by him

The following is a fabricated post about a bizarre masturbation related with bestiality and necrophilia, known as ホースくだちゃい. This is not actually Bossan's post, however it is a well-known meme associated with him.

260 名前： りぼんちゃん ◆BIJOU400pc 投稿日：2008/05/08(木) 23:33:02.73 ID:trMkEgo50
>>248
あなたにいいこと教えてあげまちゅ
市場の中の肉屋さんいって、
「ホースください」頼んでみてくだちゃい
解体処理した豚の膣の部分がもらえまちゅ
ほんとはお金かけて廃棄しないといけない部分だから無料でもらえまちゅ
食い物にはならないから
この豚の膣が極上なんでちゅ
まあ考えたら膣でちゅから
人間のじゃないだけで本物の膣なので、気持ちよくて当たり前でちゅ

Translation:

260 Name: Ribbon-chan ◆BIJOU400pc Posted: 2008/05/08(Thu) 23:33:02.73 ID:trMkEgo50
>>248
I'm going to tell you something good.
Go to the butcher shop in the market,
and please try to ask "a hose, please."
You can get the pig's vagina part they took out during the processing.
It's usually a part they have to pay to dispose of, so they'll give it to you for free,
because it can't be edible.
This pig vagina is the best of the best.
Well, come to think of it, because it's a vagina,
it's just not human's, but a real vagina, so of course it feels good.

Links

• Ribbon Guy | Know Your Meme