"heavy talk" is correct and usable in written English.
You can use it to describe a serious conversation about a weighty or important topic, such as politics, philosophy, or morality. For example: "We had some heavy talk last night about the future of the country."
Not a flash of bronzed biceps or glimpse of polished pec to lighten all the heavy talk about immigration and the NHS.
It was to produce, from under the weight of much heavy talk, a big performance, an announcement that England really do belong somewhere around the top of world football.
For all the heavy talk in this Presidential election about the alienation and suffering of the heartland, the headquarters of the two major parties' Presidential campaigns are separated only by the East River.
Small talk is small because it's the first stepping stone to getting into... "heavy talk".
Independents are split.The government's commitment to PCCs has seemed wavering recently, though two Tory heavies talked them up this week.
It's sort of heavy to talk about right now.
Under fire a few weeks ago from his Republican opponents for being heavy on talk and light on substance, he promised to put out some actual policy proposals.
But he, like Mr. Lott, said he believed a political atmosphere heavy with talk of war and national security still favored Republicans.
Blume's speech perfectly captured the mood in certain literary circles these days, where air once thick with now banned cigarette smoke instead hangs heavy with talk of the C-word.
Beware, those who enter seeking a quick answer to whether or not your son or daughter has an athletic scholarship in his or her future: the book is heavy on talk about stop codons and VO2 maxes and bivariate overlap zones, and short on easy answers.
If you are breathing too heavy to talk, you are probably working too hard.
