The rapper tweeted out her parental desires Saturday, writing ... "I want some babies." Short and sweet -- no real other context either, but on its face ... it sounds like she's ready to be a mom.

While there were a number of normies in her comments who offered up their services to get that done -- Nick actually stood out among the rest with a not-so-subtle offer of his own ... retweeting Saweetie's message and adding a few telling emojis.

There's a curious face emoji, a ninja emoji, a laughing emoji, and a guy raising his hand emoji. The hand-raising says it all ... NC seems to be down to provide, and as we know -- is very well-equipped to do so.

The man has fathered several children over the course of his life, including three just earlier this year -- his son, Zen, and twins Zion and Zillion ... the latter 2 having a different mother. He's got four more from previous relationships -- including a couple with Mariah Carey, a couple more with Brittany Bell.

He's talked about going celibate for a while, but seems to have backtracked on that ... indicated here in his volunteering -- not to mention what he told us the last time we got him out. Remember, Nick said he'll keep having kids ... just so long as the man upstairs keeps on allowing it.

No word from Saweetie yet if his proposition sounds appealing or not -- frankly, she probably has a lot of would-be suitors who'd be willing to give it a go ... and could have just about whoever she wanted for this mission.