Cardi B Says Her Birthday Gift for Offset Will Top His House Present

Cardi B has at least one bright idea about what she can give Offset for his 30th birthday -- and she's confident it will top his present to her ... assuming he's into good lovin'.

We ran into the rapper at LAX, where she was incognito and COVID-safe ... she still stood out like a sore thumb, though, on account of her unique nails. Anyway, we got to talking birthdays, because her husbands is coming up in a couple months -- and he just hooked her up with a new house in the Dominican Republic for her born day.

The natural question: Whatcha gonna get him in December that beats that???

Cardi's a little stumped on the question, but after some quick brainstorming -- she comes up with a possibility that literally made us laugh out loud. We'll say this ... Offset will NOT be disappointed. No Dad sweaters for him.

BTW, our camera guy noted something important ... Cardi might not have to get Offset a house or anything material at all, because she DID just deliver their son, who hit the big 5-0 himself on Sunday.

50 days, that is -- and still no pics of the little guy on Cardi's socials or anything -- ditto for his name. We ask Cardi about that too, and she admits we almost got her to spill the beans!!!