What is a poisontea?

A poisontea is a quatrain in ballad stanza meter, in which the tetrametric lines comprise three amphibrachs and a concluding iamb, while the trimeters have two amphibrachs and a concluding iamb.  (In plain English, it's a four-line poem with the rhythm "duh DUH duh  duh DUH duh  duh DUH duh  duh DUH / duh DUH duh  duh DUH duh  duh DUH.") The rhyme scheme is abab.

Further, the first line has the form:
 

{He/She/etc.} poisoned {his/her/etc.} {first poisoned item}, {he/she/etc.} poisoned {his/her/etc.} {second poisoned item}
 
where "first poisoned item" has two syllables and "second poisoned item" has one syllable.

It is likely that an example of a poisontea will help at this point:
 

 He poisoned her coffee, she poisoned his tea.
(Their marriage had troubles, you'd say.)
But though they'd have scoffed, the facts of the case be
They sleep side by side to this day.
 
An "ideal poisontea" features rhyming between the second feet of the first and third lines; that is, the middle of the lines rhyme (e.g., "coffee" and "scoffed, the" (sort of)).

A "strict poisontea" is a poisontea in which the two items poisoned are coffee and tea.
 
To see further examples of poisonteas (mixed in with a number of clerihews) go to the Random Doggerel Server.