！。、・・・。
Look! The potatoes are all rolling out. Honestly, you're so slow…
Literal
Look! Potato [subject-が] all rolling-out [are-てる] [わよ]. Really, you [quotative-って] slow [わねぇ]....
A scolding, affectionate tone. 転がり出る ('roll out') is a compound verb: 転がる ('to roll') + 出る ('to exit'), with the 'exiting' nuance. ほんっと emphasizes ほんと with a gemination っ for intensification. あんたって uses the casual second-person あんた and the って topic particle. トロい is casual slang for 'slow, sluggish, dim-witted' — mildly criticizing someone's pace. The final わねぇ is extended feminine, a drawn-out sigh of exasperation.