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In the finale of a drama called お天気お姉さん, around 8:26 in, I saw this subtitle:

> **一ヶ月前** の僕のアリバイかい

But the pronunciation of 一ヶ月前 sounded either like いっかつまえ or いっかすまえ to me, with
no sign whatsoever of げ. The two speakers in the dialogue are male and both
have pronounced that word the same way. One final detail I can add is that
I've noticed quite a bit of 関西弁 spoken in this. Is this slang? A regional
dialect? I can't find any info about this kind of contraction.

Update: Here's the clip(sorry it took 4 months ^^ ): <http://clyp.it/ckzojuca>
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pronunciation
字幕：一ヶ月前⇒発音：いっかすまえ?
@rintaun and I determined that this quote is from the finale of a drama called
お天気お姉さん, around 8 minutes 26 seconds in. We both listened to it and heard the
/g/, though I'd describe it as "swallowed", while rintaun described it as
"slightly elided, but it's there".

We both thought it sounded like the velar nasal allophone of /g/ which is
pronounced [ŋ], very much like the <ng> sound in English _sing_. What might
make it hard to catch is that unlike the other Japanese pronunciation of /g/,
this one doesn't actually stop the airflow, it just makes it go briefly
through the nose.

The nasal /g/ appears more often in Eastern dialects, not Western. The actor
who plays 天川 is named 北村 有起哉 (きたむら ゆきや) and according to [his official
website](http://www.yukiyakitamura.com/profile/index.html) is from Tokyo, so
it makes sense that he'd have that pronunciation of /g/.
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2014-01-13T14:19:02.963
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To add to the previous answer, I was thinking we might be imagining sounds
sometimes that may no be there to fit our concept of the word. So I took a
look at the [spectrum](http://home.cc.umanitoba.ca/~robh/howto.html) of 一ヶ月前:
![audio spectrum of 一ヶ月前](https://i.stack.imgur.com/ub1Af.png)

I have included the spectrum of the velar nasal _ng_ (ŋ) for comparison.
Observe that you can see this pattern in the middle of the _age_ sound. It is
short and faint, but the sound is there.

We can also see devoicing for the つ syllable. Note that the _u_ quite faint.
(Blue represents low, red higher and white the highest intensity in the
spectrogram above.)

(Anybody who has got more experience at analyzing spectrograms, feel free to
edit this post.)
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