Excessively enthusiastic (4,2)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">excessively enthusiastic</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for gung ho that I've seen before include "Overly enthusiastic (about war?)" , "Very (sometimes over-)enthusiastic and dedicated" , "Enthusiatic about war" , "Over-zealous to gun hog down" , "Unthinkingly eager (to fight?)" .)
(Other definitions for gaga that I've seen before include "Lady who sings" , "Slangily crazy, off one's head" , "Senile - slightly crazy" , "Doddery" , "Slang for crazy - apply a gag" .)