This is such a bad song. Please don't trouble yourself to understand it. The majority simply makes fun of it's simpleton lyrics. It's "popular" because it's so bad. To answer your question: "gotta get down on Friday" means: Subject: understood "I" Gotta = Have to Get down = party/relax/have a good time on Friday = All of this will occur on Friday It really doesn't have that deep of a meaning other than it's literal meaning. She wants to party on Friday... woooo

From the song's lyrics, the singer is waiting for Friday to arrive because she wants to have a good time on the week end.

(Yeah, Ah-Ah-Ah-Ah-Ah-Ark) Oo-ooh-ooh, hoo yeah, yeah Yeah, yeah Yeah-ah-ah Yeah-ah-ah Yeah-ah-ah Yeah-ah-ah Yeah, yeah, yeah [Rebecca Black - Verse 1] 7am, waking up in the morning Gotta be fresh, gotta go downstairs Gotta have my bowl, gotta have cereal Seein’ everything, the time is goin’ Tickin’ on and on, everybody’s rushin’ Gotta get down to the bus stop Gotta catch my bus, I see my friends (My friends) Kickin’ in the front seat Sittin’ in the back seat Gotta make my mind up Which seat can I take? It’s Friday, Friday Gotta get down on Friday Everybody’s lookin’ forward to the weekend, weekend Friday, Friday Gettin’ down on Friday Everybody’s lookin’ forward to the weekend Partyin’, partyin’ (Yeah) Partyin’, partyin’ (Yeah) Fun, fun, fun, fun Lookin’ forward to the weekend [Rebecca Black - Verse 2] 7:45, we’re drivin’ on the highway Cruisin’ so fast, I want time to fly Fun, fun, think about fun You know what it is I got this, you got this My friend is by my right I got this, you got this Now you know it Kickin’ in the front seat Sittin’ in the back seat Gotta make my mind up Which seat can I take? [Chorus] It’s Friday, Friday Gotta get down on Friday Everybody’s lookin’ forward to the weekend, weekend Friday, Friday

I don't know the song, but people will say 'gatta get down' when they mean they should do something. By itself, it would mean that the person wants to party and or dance.