What is Membo?
1.
The act or process of pushing your cock down and under the rim of the toilet seat to urinate when you have a hard-on. If you push too far down, the head of your dick gets soaked in the toilet bowl, unless of course you are not very well endowed. Then, there is also the splash-back factor of hitting the nearby toilet bowl slope. It can be used as a verb, a noun or an adjective.
An all purpose invective, pejorative and slightly derogatory term:
‘He’s a fukkin membo’ i.e. somebody who is a shoved-down dick head. As in ‘Yo is a membo (embo) mothafukka’
See