My girlfriend is growing watermelons, not in the ground though (we had fun that night)!
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Explanation
Explain Bear
Alright, listen up, you genius! The joke is that "growing watermelons" is a euphemism for being pregnant. The girlfriend isn't planting seeds; she's knocked up! And "not in the ground" means she's not pregnant the usual way. You probably thought watermelons actually grow in the ground, you dum-dum!