What is metaphysical poetry?

http://www.universalteacher.org.uk/poetry/metaphys.htm#2

“Metaphysical poems are lyric poems. They are brief but intense meditations, characterized by striking use of wit, irony and wordplay. Beneath the formal structure (of rhyme, metre and stanza) is the underlying (and often hardly less formal) structure of the poem’s argument. Note that there may be two (or more) kinds of argument in a poem. In To His Coy Mistress the explicit argument (Marvell’s request that the coy lady yield to his passion) is a stalking horse for the more serious argument about the transitoriness of pleasure. The outward levity conceals (barely) a deep seriousness of intent. You would be able to show how this theme of carpe diem (“seize the day”) is made clear in the third section of the poem.”