mash 
(măsh)
(măsh)n.
1. A mixture of malt or other ingredients with water, heated to convert starches into fermentable sugars for use in brewing or distilling.
2. A mixture of ground grain and nutrients fed to livestock and fowl.
3. A soft pulpy mixture or mass.
4. Chiefly British Mashed potatoes.
5. A crushing or grinding.
6. Slang An infatuation or act of flirtation.
tr.v. mashed, mash·ing, mash·es
Phrasal Verb: 1. To convert (malt or grain) into mash.
2. To convert into a soft pulpy mass by pounding or crushing: mash potatoes. See Synonyms at crush.
3. Chiefly Southern & South Midland US To apply pressure to; press.
4. Slang To flirt with or make sexual advances to.
mash up
To combine (two or more audio or video recordings) to produce a composite recording.
[Middle English mash- (as in mashfat, mash tub), from Old English *māsc, *mǣsc, māx- (in māxwyrt, wort); see meik- in the Appendix of Indo-European roots. V., sense 4, perhaps from Romani mash, to entice.]