「昨日の今日だし・・・その・・・性器が痛かったりは？」「まだ、少しヒリヒリしますけど」

「・・・・・・？」「、」

'After last night... um... are your genitals sore at all?' 'Still kind of stinging a little.'

Literal

''Yesterday [possessive-の] today is-[and-し]... um... genitals [subject-が] painful [or-(omitted)] [topic-は]?'' ''Still, a-little sting [emphatic-ますけど].''

An awkward morning-after exchange. 昨日の今日 ('yesterday's today') is a set idiom meaning 'it's only been a day, so soon after yesterday' — acknowledging that too little time has passed. The ~し is the 'and' particle giving a reason without stating the consequence. ヒリヒリ is an onomatopoeia for stinging, burning, raw pain. ~はの is an interrupted/softened question form using topic marking.