muhurnatvA mUrdhnA vinatavividhApat prashamane
	shaThAre: pAdAbje madhurakavidevasya sharaNe |
idam yAche vAchApyalakavakuLALI parigaLat
	madhULImAdhuryam mama vachanabha~NgyAm sa dishatu ||

Meaning:

natvA 				- I worship
mUrdhnA 			- with my head
muhu: 				- time and again
shaThAre: pAdAbje 		- the divine lotus feet of Nammazhvar,
vinata vividha Apat prashamane	- which remove the very many dangers of the worshipping devotees, and
sharaNe 			- are the means to surrender
madhurakavi devasya 		- for Madhurakavi Azhvar.
sa: 				- (May) that Nammazhvar
dishatu 			- grant
alaka vakuLALI parigaLat 
  madhULI mAdhuryam 		- that honey like sweetness, which comes from the Vakula garland worn on his hair
mama 				- (to) my
vachana bha~NgyAm 		- clever speech.
yAche 				- I pray
idam 				- for this matter
vAchA api 			- with my words.

Vyakhyana Saram:
In this shloka, Vedanta Desikan prays to Nammazhvar to grant him the sweetness of his pasurams so that he too can write shlokas with the same sweetness. Madhurakavi Azhvar too had said "aNNikkum amudhURum en nAvukkE". Nammazhvar is famous for wearing the garland made of Vakula flowers - he is known as 'Vakulabarana". Swami Desikan is asking for the honey like sweetness of those flowers to be in his speech.

Nammazhvar's divine feet are the refuge of Madhurakavi Azhvar - "mEvinEn avan ponnadi meymmaiyE" is Madhurakavi Azhvar's words. The Lord's divine feet are known as Shathari - which is the name for Shathakopa. Nammazhvar's divine feet are known as Madhurakavi.