Hello, maybe the song you're looking for is "Funiculì Funiculà", where actually there is a line that goes "Jammo, jammo"...
Is a song about a cable car which was built in Naples in 1880 to carry people up to Vesuvio's crater, and never rebuilt after the third destruction in 1944.

(being italian, although not from Naples, helps a lot...)
Peace
Lanf

Here is the lyrics:

Funiculì funiculà
(G.Turco-L.Denza)

"Aieressera, Nanninè, me ne sagliette
tu saie addò!
Addò to core 'ngrato chiù dispiette
farme nun po'.
Addò lo foco coce, ma si fuje
te lasse stà
e nun te corre appriesso nun te struje
sulo a guarda'
Jammo, jammo, 'ncoppa jammo, ja'...
Funiculì, Funicula'!

Se n''e sagliuta, oie Ne', se n''e sagliuta,
La capa gia';
E' ghiuta, po' e' tornata, e po' e' venuta...
Sta sempe cca'!
La capa vota vota attuorno, attuorno,
Attuorno a te,
Llo core canta sempe nu taluomo.
Sposammo, oie Ne'!
Jammo, jammo, 'ncoppa jammo, ja'...
Funiculì, Funicula'!"