Any yaoi manga with a thick uke? Like with thick thighs or something? All the yaoi manga I...

Liebling. It’s a webtoon.
Also, if you’re really looking for thick ukes and semes, you might want to click on the genre tag “Bara”. You can find muscular bodies there.

http://www.mangago.me/read-manga/hoppe_ni_himawari/
http://www.mangago.me/read-manga/deri_pocha_yajuu_no_h_na_gohan/
The uke isn’t chubby but he has fat ass lmao http://www.mangago.me/read-manga/shiri_fechi_nanka_ni_sukarete_tamaru_ka/

I haven’t read it but like the uke in Price of Proctology looks pretty thicc to me

http://www.mangago.me/home/mangalist/413334/
http://www.mangago.me/tag/Buff%20uke%20/?page=1