"bit of a dash" is a correct and usable phrase in written English.
You can use it informally in the sense of displaying a small amount of enthusiasm or energy. For example, "She gave the presentation a bit of a dash."
He should just have a bit of a dash, really.
"It was all a bit of a dash this morning," she admits afterwards.
All these made a significant splash on the international circuit: those that remain have (mostly) cut bit of a dash too.
It's all been a bit of a dash and a rush: this is the time of year when I get flung from festival to festival with barely a moment's pause.
Ramdin fancies a bit of a dash but some fine fielding from Cook keeps him to a single.
1254 - Eng 337-7: The baby-faced Broad has a bit of a dash outside off stump but doesn't middle it and it's just a single.
And it was a picture, I guess, from the early to mid-seventies, and Menello had a bit of a dashing quality.
My dad is fringe, in the same way Frank Reynolds is fringe in fact, he's a lot like Frank Reynolds, interspersed with a little bit of Homer Simpson, a dash of Harrison Ford, and a whole lot of Larry David.
Earlier, when the pair still had 15 empty slots, Mr Pratchett said they were in "a bit of a mad dash" to get them filled.
Barreling around the stage, her eyes ablaze with indignation or melting in sympathy, Ms. Phaneuf turned the character into a whirlwind of comic energy tinged with pathos: a bit Blanche DuBois, a dash of the blowzy Maxine from "The Night of the Iguana," but with the braying mouth of Phyllis Diller.
Yet apart from desultory criticism of his friend Gower's poetry ("Perhaps if you lightened up a bit, added a dash of humor to your biting satire...
