EE OO is that sound that that you hear at the beginning of the song called The Box.
This is typically sung by tiktok thots and people from the ghetto.
here is an example of the pronunciation below, it may make more sense if you know the lyrics;
"EE OO........
EE OO.........
EE OO..........
HUM INUM INHUTHUH BOX
TOLDUHFUH TWELFUH SQUAH
HUMINUNUSHICENUH BOX
HADDAPUDISDIC INNA BOX
UNH
PULLUH THE WHOLE DAM SEAL
IMMA GEH LAAAAAAAAAAAAAZZZZZZZZZY"
23👍 8👎