Drenched in sweat; literally 'soaking with sweat'—colloquial expression for being very sweaty.
炎天下で自転車をこいで汗だくになった。
I pedaled my bicycle in the blazing sun and got drenched in sweat.
面接で緊張して汗だくになってしまった。
I got so nervous at the interview that I was soaked with sweat.
運動したらすぐ汗だくになる体質だ。
I tend to get sweaty immediately when I exercise.