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Colloquial for hyperactive; overly excited, energetic, or nervous.
Die Kinder waren vom vielen Zucker total hyper und rannten durch die ganze Wohnung.
The children were totally hyper from all the sugar and ran through the whole apartment.
'Hyper' is a colloquial shortening of the word 'hyperaktiv' (hyperactive). The prefix 'hyper-' comes from Greek and means 'over' or 'excessively'.
Ein hyperaktives Kind braucht viel Bewegung.
A hyperactive child needs a lot of movement.
This word is used almost exclusively in colloquial speech. In formal or written contexts, it is uncommon.
Nach drei Tassen Kaffee war ich total hyper und konnte nicht still sitzen.
After three cups of coffee, I was totally hyper and couldn't sit still.
'Hyper' is almost always used predicatively, meaning after a verb such as 'sein' (to be) or 'werden' (to become). Using it directly before a noun (attributively) is very rare and sounds unnatural.
Sei nicht so hyper, setz dich mal kurz hin!
Don't be so hyper; sit down for a moment!
quiet / calm
'ruhig' and 'hyper' describe opposite states in people. 'ruhig' means that someone is calm or moves very little. 'hyper' is colloquial and means that someone is very excited, full of energy, or nervous. 'ruhig' can sound neutral or positive. 'hyper' is used more in casual language, often when someone has too much energy or can hardly sit still.
Nach zwei Gläsern Cola war sie so hyper, dass sie nicht schlafen wollte.
After two glasses of cola, she was so hyper that she did not want to sleep.
Nach dem langen Spaziergang war das Kind endlich ruhig.
After the long walk, the child was finally calm.