A “Yellow cap” is a term used to name players on Roblox who have their display name as Japanese Kanji, (or any foreign langue to them really). These are people who usually do not speak the language in their display name.
“Look at that yellow caps outfit” “oh yeah we were fighting that yellow cap earlier”
The act of drinking piss.
"God, that yellow pepsi was so refreshing"
Hey Bob, I went in to my grandfather's bathroom and saw some yellow dust.
Yellow paint, in bottles or balloons, containing human urine, thrown in protest at the scene of police beatings, police shootings, and police speed traps in order to warn the public of these police activities.
Those pigs get the yellow stain of shame
Bad intel, or a claim of wrong knowledge.
It's yellow cake, proclaims the the man in response to the inaccurate statement of fact.
A young woman who continually attempts and fails to "steal" your significant other, though said other has no interest in anyone other than you. Often mistaken for a slut, this person lacks in social skills and finesse, and is a general tease to the male population. Not considered dangerous, but can be excessively irritating.
I would love to tear that yellow-haired pygmy's face off, but she's not worth the effort.