what is grammar pattern for やさしくった


I watched a series. There is a scene, while subtitle text is written as
優しく言ってあげた I heard something like やさしくったあげた。 so I did some search to check if
this usage exist in real world. In google I found some, but in twitter there
are few of tweet using やさしくった。 the following are my questions,

  1. what is grammar pattern for this? is やさしくった abbreviation form of 優しく言って?
  2. are there any resources (book/website/etc.) about Japanese spoken language? I try searching for book using 口語 but I don't think that is what I want. 

Also I feel that there is a high probability to be just a mismatch between
subtitle and voice.

here is the [sound file](https://1drv.ms/u/s!AgzDHZ5g1Kxulp4ZqfcWTuUpuhhpIA)
(now that @l'électeur mentioned this and I wonder why I don't record the
sound. Thank you for your suggestion!)

Thank you in advance!




In Standard Japanese, the **_only_** correct and natural use of 「やさしくった」 would
be within the phrase:

> 「やさしくったって」

which means " ** _even if (someone) were gentle_** " or " ** _even if
(something) were easy_** " in very informal speech. Drop the first 「っ」 and it
will become a tiny bit less informal. You might want to listen to the
beginning of this song:

<https://www.youtube.com/watch?v=ysOL_EK_S2U>

That is to say any other usage of 「やさしくった」 would be a mistake, typo,
mishearing, etc.

>   1. what is grammar pattern for this? is やさしくった abbreviation form of
> 優しく言って?
>

No, 「やさしくった」 would never be an abbreviation of 「優{やさ}しく言{い}って」 in Standard
Japanese (or any other "major" dialects I know of.)

**「優しく言って」 cannot even be abbreviated in the first place**.

>   2. are there any resources (book/website/etc.) about Japanese spoken
> language? I try searching for book using 口語 but I don't think that is what I
> want.
>

Questions about resouces are off-topic here. Perhaps the Japanese-learners
here could give advice as I am not one myself.

Thus, 「やさしくったあげた」 makes no sense, sorry to say. That sounds just so
nonsensical to my Japanese ears if I may add.

> Also I feel that there is a high probability to be just a mismatch between
> subtitle and voice.

More like between subtitles and the viewers' listening comprehension skills.
If you provide an audio, this problem will be solved in an instant.

