Contracting いる+の to いんの
Grammar: Colloquial and Casual Speech » Contracting 〜いる+の to 〜いんの
The verb いる followed by the particle の may contract as いんの.
Examples
Is something there with いんの

In a game of hide-and-seek, Conan and Ayumu find they’re hiding on the same bench. Their conversation attracts the seeker, Genta, leading him to find Conan. As Ayumu sneaks away unseen, she signals an apology to Conan.
- コナン:
- 「バカ 早く隠れてろ!」
- “Stupid, hurry and hide!”
- 元太:
- 「ん? なんかいんのか?」
- “Mm? Is something there?”
See Also
Where are you at with いんの

Azu is with her friends, waiting for Suwa. They call him to find what’s keeping him, and while Azu talks with Suwa by phone, she hears an echo of his voice in the distance.
- あずさ:
- 「須和? 今どこにいんの?」
- “Suwa? Where is it you're at right now?”
- 須和:
- 「じゃあ もう切る」
- “Well, I'm hanging up now.”
- あずさ:
- 「えっ」
- “Eh?”
いるの contracts here to いんの.
See Also
Why is it you're here with いんの

Aru returns to her classroom after club. Expecting the classroom to be empty, she’s singing a song about herself as she enters the room. There, she finds her friends idling away the time.
- アル:
- 「なな 何で皆いんのよ!(誰もいないと思ってた!)」
- “Wh- why is it that you all are here?! (I was thinking no one was here!)”
- なこ:
- 「(なんだ今の歌…)」
- “(What was with that song just now...)”
- ソトカ:
- 「師匠がアルを待つって」
- “Master said she'd wait for you.”
- アル:
- 「でも私部活あるわよ」
- “But I'm in a club!”
Note: Sotoka refers to Bocchi as 師匠.