What does it mean to be spoiled, exactly?

Yeah. There's a difference between being a spoiled brat and being just plain spoiled.

... copied off dictionary.com ....

spoil   [spoil] 表示する IPA verb, spoiled または spoilt, spoil·ing, noun
verb (used with object)
1.
to damage severely または harm (something), especially with reference to its excellence, value, usefulness, etc.: The water stain spoiled the painting. Drought spoiled the コーン, トウモロコシ crop.
2.
to diminish または impair the quality of; affect detrimentally: Bad weather spoiled their vacation.
3.
to impair, damage, または harm the character または nature of (someone) によって unwise treatment, excessive indulgence, etc.: to spoil a child によって pampering him.
4.
Archaic . to strip (persons, places, etc.) of goods, valuables, etc.; plunder; pillage; despoil.
5.
Archaic . to take または seize によって force.

Your not spoiled in my opinion.

Being spoiled means that あなた just have to get everything あなた want,no matter what the reason. Throwing tantrums when あなた don't get what あなた like.Begging like your about to die for things that あなた don't really need.

^Well that's my definition of it anyways.

Duh,it means to get every thing あなた want,so when あなた ask for it あなた get it!!!!!!!!basiclly thats what it means.