A man who is sexually active who is also the coherent owner of a small penis (small meat).
Also a woman/male who has a sexual encounter with a man with a small penis can be said to of had a (Small Meat Romance)
Bob; did you see lil Jerry in the shower today after football? Didnât realise he was a small meat romantic
George; yeah only just tho, poor bloke wasnât given much in the penis department, canât believe his wife is so open about her small meat romance