Contracting いる+の to いんの
Grammar: Colloquial and Casual Speech » Contracting 〜いる+の to 〜いんの
In casual speech, いる followed by の may contract to 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?”
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?”
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!”