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Someone has left the following comment on a music video on youtube: 「Crying
End Rollは名盤、はっきりわかんだね。﻿」

Crying end roll is the name of the album, which the song in the video is on.
is わかん a shortening of わかる？
CC BY-SA 3.0
2017-08-27T08:45:17.330
52729
2021-01-20T05:21:26.527
16132
question
words slang
what does わかん mean?
Yes! I think so.

はっきりわかるのだね。---> はっきりわかるんだね。---> はっきりわかんだね。
CC BY-SA 3.0
2017-08-27T08:58:08.977
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2017-08-27T08:58:08.977
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answer
わかんだ is not used in modern standard Japanese. If this ん were explanatory-の/ん,
it requires a dictionary form of before it. わかるだ/わかんだ exists in some
Eastern/Nothern dialects, but it sounds fairly provincial.

In fact, this [はっきりわかんだね](http://netyougo.com/2ch/9037.html) is one of so-
called
[淫夢語](http://dic.nicovideo.jp/a/%E6%B7%AB%E5%A4%A2%E8%AA%9E%E9%8C%B2\(coat\)),
an Internet meme based on a certain gay porn video series. Semantically it
just means something like "That's for sure." Some words originating from this
video series are quite popular among net users, and many people are using them
even without knowing their origin.

Anyway, はっきりわかんだね is broken as a proper Japanese expression. Use it only when
you know what you are doing.

**EDIT:** As @goldbrick pointed out, there are cases where 分かん, 飲めん, 来てん, and
such can directly attach to だよ, だな, だろ, etc. They sound rough but not
particularly dialectal. 分かん can be a sound change of both 分かる and 分かるの,
depending on the context. Nevertheless, わかんだね sounds rare to me, presumably
because it's a mixture of rough and mild expressions.
CC BY-SA 3.0
2017-08-27T09:43:13.470
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2017-08-28T01:12:43.943
2017-08-28T01:12:43.943
5010
5010
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answer