Speaking of poetry or ease of speech, is there a common way of shortening adjectives? An example of my question using a noun instead of an adjective would be saying "mei-" perhaps, instead of "meine," to not confuse with "mein?" But my question relates to adjectives.
This isn't about grammar but about creating a mingle of sounds hardly understandable.
There is no rule but flattening all vowels sticking out, omitting the -e, du and shortning -en and even ein to 'n is typical. Often parts of compound words are skipped when they can be guessed from context.
Ich brauche ein neues Auto. – Hast du schon einmal über einen Gebrauchtwagen nachgedacht?
'ch brauchn'neus Auto. — Hast'schoma über'n Gebraucht'n nachj'dacht?