Why 'did you' turns into a sound that isn't in either word.

This isn't a contraction like gonna or wanna. It's two separate sounds merging into a brand new one at the boundary.

“Gonna” and “wanna” are shortcuts: “going to” and “want to” getting compressed, but each word is still recognizably itself. “Did you” turning into “didjeet” is a different mechanism entirely. The /d/ sound at the end of “did” and the /y/ sound at the start of “you” blend together into a completely new sound, a soft “j.” Neither original sound survives on its own.

Written vs. Spoken: The Same Sentence, Twice

This merge happens anywhere a word ending in /d/ or /t/ meets “you” head-on.

Written

Did you eat yet?

Spoken at normal speed

Didjeet yet?

Written

Don't you want some?

Spoken at normal speed

Dontcha want some?

Written

Meet you there.

Spoken at normal speed

Meetchu there.

Written

Could you help me?

Spoken at normal speed

Couldja help me?

Written

What did you say?

Spoken at normal speed

Whadja say?

The Mechanism, Not Just the Example

Linguists call this palatalization. Four things worth knowing about how it actually works.

Two sounds, one new sound

This isn't two words spoken close together. The final sound of one word and the first sound of the next physically merge into a third sound that isn't quite either original one.

It only happens at word boundaries

Say "did" alone, then "you" alone, and both sound completely normal. The merge only happens when they collide mid-sentence, at native speaking speed, with no pause between them.

Every accent does some version of this

This isn't a regional quirk or an informal shortcut used by some speakers and not others. Palatalization like this shows up across American, British, and Australian English alike, in casual speech.

Formal speech resists it, but doesn't erase it

A newsreader reading from a script will separate the words more clearly. A newsreader speaking off the cuff, mid-interview, will very often let the same merge happen anyway.

Why this one is easy to miss

This isn't written anywhere the way “gonna” sometimes is in casual texting. Nobody writes “didjeet,” so there's no visual version to recognize it from later. It only exists in the spoken sound itself, which means the only way to learn it is by hearing it repeatedly until it stops registering as unfamiliar noise.
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Once this merge is on your radar, it starts showing up constantly: one of the most common sound patterns in casual spoken English, hiding in plain sight simply because nobody ever writes it down.

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