WARNING: Should not be confused with the more standard verb "tank", meaning "to fail", as in "I tanked my exam" (i.e. "I failed my exam; I did poorly on my exam"). Though this verb is rarely employed in the imperative form, speakers unfamiliar with its secondary slang meaning may interpret it the wrong way.
"You'll be fine, just tank it!"
"I'm getting really nervous, I don't think I can do my presentation"
"Stop thinking so much about it. When the teacher calls you up, get up there and tank it. Do it like a boss, forget about the others."