Sims 1+2+3 term of endearment. means "baby" in Simlish. When a Sim is about to give birth, they yell "nooboo!" They also often coo the word at their babies.
noobong 1 (núbng, núbông)
n.
A noob but with the sound 'bong' at the back, as of a bell.
v. noobonged, noobong·ing, noobongs
v.tr.
To call to someone noob but with a longer tone.
v.intr.
To acknowledge a noob with better tone.