sav·vy 
(săvē) Informal
(săvē) Informal adj. sav·vi·er, sav·vi·est
1. Well informed and perceptive; shrewd: savvy Washington insiders.
2. Knowledgeable or proficient. Often used in combination: tech-savvy; media-savvy.
n.
Practical understanding or shrewdness: a banker known for financial savvy.
tr. & intr.v. sav·vied (săvēd), sav·vy·ing, sav·vies (săvēz)
To understand; comprehend.
[From Spanish sabe (usted), (you) know, from saber, to know, from Old Spanish, from Vulgar Latin *sapēre, from Latin sapere, to be wise; see sep- in the Appendix of Indo-European roots.]
savvi·ly adv.