To getcha,betcha,tcha,wantcha ,etc.
I can saw and heard those words anywhere.
How to explain "-cha"?
In this sentence, "I want your book", we have this sequence of phonemes /t/ (last sound of "want") then /j/ (first sound of "your"). When speaking these two sounds fast, the mouth naturally produces a /ʧ/ sound (which often appears in writing as "ch") instead.
You hear it also with Tuesday. When said very precisely, it would sound like this : /tjuːzdeɪ/
When said by most native speakers normally, it sounds like this : /ʧuːzdeɪ/ (think "choose day").
If anyone is not familiar with phonemic script, I recommend these links :
d+ y = j
t + y = ch
Small function words can be predicted / filled in by two fluent speakers so there is no need to fully enunciate every sound of every word ... speakers abbreviate the movement of the lips to save time / to hit the BEAT of the sentence. It's important for the sentence stress to be on the vowels that carry the meaning than to fully articulate every phoneme in function words.
In addition to sounds and whole words that are omitted in everyday spoken English, sounds are also blended together in many places. We call the blending of sounds assimilation.
=Did you eat yet?
The d from did and the y in yet becomes a j sound.
Another example of assimilation that frequently occurs is when one word ends in /t/ and the next word begins with /y/. Proficient speakers will produce a /ch/ sound.
I knowwhacha mean
=I know what you mean.
The /t/ sound in what has been blended with the /y/ in you creating a /cha/ sound producing whacha.
Oops - it could also mean "you". Examples:
"I want you to sit down" might sound like "I wantcha to sit down".
"Get your red hot hot dogs" might sound like "Getcha red hot hot dogs".