The meaning is tough to generalize, but "Essence" comes close.
What's up? This is the most common greeting among young people
Así es la onda Mexicana
That's the mexican way/style
Le tiró la onda.
He/She came on to him/her
¿Cual es tu onda?
What interests you/what are you like/what do you do?
!Que Buena Onda!
That rules! What a nice person/action!
Que mala Onda
What a shame, What a reprehensible person/action
A gang in Georgia in the city of Gainesville or AKA "The C.O.G." They claim the eastside and the color baby blue and the number 05. Has a alliance with B.O.E. 23 and is rivals with Sur13 & MVS 13 gangs.
Eastside 05 4 Life