"send up in a slow, high arc," 1869, of artillery shells; 1875 of tennis strokes, of uncertain origin, perhaps somehow from some sense in lob (n.). Earlier the verb meant "to throw slowly or gently" in bowling (1824) Related: Lobbed; lobbing. The noun in the "high, arcing throw or hit" sense (originally in tennis) is from 1875, from the verb.
a word of widespread application to lumpish things or suggesting heaviness, pendence, or floppiness, probably ultimately from an unrecorded Old English word. Compare East Frisian lobbe "hanging lump of flesh," Dutch lob "hanging lip, ruffle, hanging sleeve," Danish lobbes "clown, bumpkin;" Old English lobbe "spider." From late 13c. as a surname; meaning "pollack" is from early 14c.; that of "lazy lout" is from late 14c. Meaning "thick mixture" is from 1839, originally in brewing.