go jump in the lake

Go jump in the lake! AND Go jump in a lake! {infml} (an expression of contemptuous disagreement milder than "go fly a kite"; an impolite way of telling someone to go away and stop annoying you ) — отстань ты, отвали

Example 2:I think she's right. — Oh, go jump in the lake. — ... Да иди ты...
(~ Перегрелся, что ли? Пойди освежись / проветрись/...)

Example 2:This guy just wouldn't leave us alone, so finally I told him to go jump in the lake. (thefreedictionary.com)

see also
[отстань]
[bite me]
[go fly a kite]
[send sb packing]