Dat's a komplete sen-tanc der in my book.... if ya no what I mean!
Okay, I'm gonna be picky about "
der":

If yer gonna go inventing such slang(?) you have to consider that there really is a correlation between spelling and pronunciation!
Note that "
der" comes off reading like the German grammatical masculine article "
der", equivalent to "the" in English, as in:
German
| English
|
Der Hund
| The dog
|
Der Spiegel
| The mirror
|
Der Führer
| (Well, you know.)
|
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So if you're trying to fabricate an analog of
"there" as it might sound in "U.P. English" or "Yooperese",
c.f. (click →)
"Yooper Talk: Dialect as Identity in Michigan's Upper Peninsula", by Kathryn A. Remlinger, then you should probably use "
dere" (pronounced ≈"dare"), thus:
"Ya hey
dere…"
"Dat's a komplete sen-tanc(?)
dere in my book…"
"FRNash lähtee soapboxista." ("FRNash leaves the soapbox.")