To give birth to Pumbaa is to push out a huge log ... to have a shit ... It's big, brown and smelly just like Pumbaa from The Lion King ... think of Pumbaa being born.
The perfect gay lovers. One of them is super into it (pumba) and loud about the relationship whist the other (the one with perfect posture obvi (timon)) publicly hates the other but secretly loves them.
"Look at that loud fat lard and that skinny guy rolling his eyes.... Total timon and pumba situation"
"You sure?"
"Oh yeah... Look at the skinny ones posture, flawless"
"Oh nards man, you right"
Based off Disney's character, Pumbaa is used to describe the "big" one in a group of girls who typically cockblocks guys from the prettier girls in the group. Pumbaas exist because they do not get any love and thus prevent every other girl in their group from getting love as well.
Man did you see the pumbaa swoop in and grab her girl away from me?
Man that pumbaa was real nasty, I think she even had tusks on her.