I beat up all on her beaver
Now she wanna feed the meter!
Beaver is here used as a metaphor for vagina, so he is saying he banged her until she ejaculated, and then she wanted to give him a blowjob.
Also, to “feed the meter” would mean you want to stay somewhere longer, as in putting change into a parking meter, so even though Wrek just fucked the shit out of her, she wants more.
To help improve the meaning of these lyrics, visit "So Dope (They Wanna)" by Tech N9ne (Ft. Snow Tha Product, Twisted Insane & Wrekonize) Lyrics and leave a comment on the lyrics box