Meaty is used to describe the likes of a cool sounding part of a song, something thats found to be cool, or a physically big/thick object (most commnly a bag of weed)
'aye mate a just got a meaty bit a hash'
'your arms are pure meaty lookin mate'
'that burds got a meaty booty man shes gettin the bone'
Someone who likes slightly bigger girls...refer to them as meaty and not fat.
"she's nice and meaty!"
that spliff was meaty