On gloss:

nanla
x1 is a boy/lad [young male person] of age x2 immature by standard x3.

In definition:

fetpibyta'u
x1=t1 is panties/knickers/boy shorts (female genital underwear), serving purpose x2=t3
dansrbreiki
d1 (individual, mass) is breaking/b-boying/b-girling/breakdances to accompaniment/music/rhythm d2.
einla
x1 is a gender role for boys in culture x2; in culture x2, typical boys are obliged to do x1.

In notes:

nakpibyta'u
x1=t1 is boxer shorts/boxer briefs/briefs/jockstrap (male genital underwear), serving purpose x2=t3